diff --git a/src/Bot.ts b/src/Bot.ts
index cfdb115..a6c6a44 100644
--- a/src/Bot.ts
+++ b/src/Bot.ts
@@ -75,7 +75,7 @@ export class Bot extends EventEmitter {
      * @param {string} [token] - app token from Discord Developer Portal
      * @returns *Promise<boolean>*
      */
-    async start(port?: number): Promise<boolean> {
+    async start(port?: number, register?: boolean): Promise<boolean> {
         try {
             console.log(`\nBot name: ${this.name}`);
             console.log(`Prefix: ${this.commands.prefix} \n`);
@@ -102,16 +102,20 @@ export class Bot extends EventEmitter {
             process.stdout.write("Connecting to Discord... ");
             this.client.login(this.token);
             this.client.on("ready", async () => {
-                console.log("✔");
-                process.stdout.write("Registering commands... ");
-                this.commands.list.map(async (c) => {
-                    await axios.post(
+                if (register === undefined || register === true) {
+                    console.log("✔");
+                    process.stdout.write("Registering commands... ");
+                    await axios.put(
                         `https://discord.com/api/v8/applications/${this.applicationId}/commands`,
-                        c.toCommandObject(),
+                        this.commands.list.map((c) =>
+                            !c.guilds ? c.toCommandObject() : {}
+                        ),
                         { headers: { Authorization: `Bot ${this.token}` } }
                     );
-                });
-                console.log("✔\n");
+                    console.log("✔\n");
+                } else {
+                    console.log("✔\n");
+                }
                 this.emit("READY");
             });
             this.client.on("message", async (m) => {
diff --git a/src/Command.ts b/src/Command.ts
index fbcb3b3..8bbdb58 100644
--- a/src/Command.ts
+++ b/src/Command.ts
@@ -6,19 +6,19 @@ import {
     ParameterResolvable,
 } from "./types.js";
 import { MissingParameterError, PermissionsError } from "./errors.js";
-import { Parameter, ProcessArgument } from "./Parameter.js";
+import { Parameter } from "./Parameter.js";
 
 //CLASSES
 export class Command {
     name: string;
-    parameters: Parameter[];
-    aliases: string[];
-    keywords: string[];
+    parameters?: Parameter[];
+    aliases?: string[];
+    keywords?: string[];
     description: string;
-    usage: string;
+    usage?: string;
     permissionCheck: PermissionCheckTypes;
-    permissions: Permissions;
-    guilds: Guild[];
+    permissions?: Permissions;
+    guilds?: Guild[];
     visible: boolean;
     private function: (
         message?: Message,
@@ -41,7 +41,9 @@ export class Command {
      */
     constructor(options: CommandBuilder) {
         this.name = options.name.split(" ").join("_");
-        this.parameters = options.parameters || [];
+        this.parameters = options.parameters
+            ? options.parameters.map((p) => new Parameter(p))
+            : undefined;
         this.aliases = Command.processPhrase(options.aliases);
         this.keywords = Command.processPhrase(options.keywords);
         this.description = options.description || "No description";
@@ -50,13 +52,18 @@ export class Command {
             options.permissionCheck == "ALL" || options.permissionCheck == "ANY"
                 ? options.permissionCheck
                 : "ANY";
-        this.permissions = new Permissions(options.permissions || undefined);
-        this.guilds = options.guilds || [];
+        this.permissions = options.permissions
+            ? new Permissions(options.permissions)
+            : undefined;
+        this.guilds = options.guilds;
         this.visible = options.visible != undefined ? options.visible : true;
         this.function = options.function;
-        /*if (!new RegExp("^[w-]{1,32}$").test(this.name)) {
+        if (!/^[\w-]{1,32}$/.test(this.name)) {
             throw new Error(`Incorrect command name: ${this.name}`);
-        }*/
+        }
+        if (this.description.length > 100) {
+            throw new Error("Command description is too long");
+        }
     }
 
     /**
@@ -69,17 +76,18 @@ export class Command {
         const memberPermissions: Readonly<Permissions> =
             message?.member?.permissions || new Permissions();
         if (
-            this.permissionCheck == "ALL"
+            !this.permissions ||
+            (this.permissionCheck == "ALL"
                 ? memberPermissions.has(this.permissions, true)
-                : memberPermissions.any(this.permissions, true)
+                : memberPermissions.any(this.permissions, true))
         ) {
             let inputArguments: ParameterResolvable[] = cmdParams || [];
-            if (this.parameters.length > 0) {
+            if (this.parameters) {
                 this.parameters.map((a, i) => {
                     if (!inputArguments[i] && !a.optional) {
                         throw new MissingParameterError(a);
                     } else if (inputArguments[i]) {
-                        inputArguments[i] = ProcessArgument(
+                        inputArguments[i] = Parameter.process(
                             inputArguments[i] as string,
                             a.type
                         );
@@ -98,14 +106,45 @@ export class Command {
     }
 
     toCommandObject() {
+        let options: any[] = [];
+        if (this.parameters) {
+            options = this.parameters.map((p) => {
+                let type = 3;
+                if (!/^[\w-]{1,32}$/.test(p.name)) {
+                    throw new Error(
+                        `Failed to register ${p.name} parameter for ${this.name}: The option name is incorrect`
+                    );
+                }
+                if ((p.description || "No description").length > 100) {
+                    throw new Error(
+                        `Failed to register ${p.name} parameter for ${this.name}: The description is too long`
+                    );
+                }
+                if (p.type == "boolean") type = 5;
+                else if (p.type == "user") type = 6;
+                else if (p.type == "channel") type = 7;
+                else if (p.type == "role") type = 8;
+                else if (p.type == "mentionable") type = 9;
+                else if (p.type == "number") type = 10;
+                return {
+                    name: p.name,
+                    description: p.description || "No description",
+                    required: !p.optional,
+                    type: type,
+                    choices: p.choices || [],
+                };
+            });
+        }
         return {
             name: this.name,
             description: this.description,
-            options: [],
+            options: options,
         };
     }
 
-    private static processPhrase(phrase?: string | string[]): string[] {
+    private static processPhrase(
+        phrase?: string | string[]
+    ): string[] | undefined {
         if (Array.isArray(phrase)) {
             const buff = phrase.map((p) => {
                 return p.split(" ").join("_");
@@ -121,17 +160,18 @@ export class Command {
             buff.push(phrase.split(" ").join("_"));
             return buff;
         } else {
-            return [];
+            return undefined;
         }
     }
 
     private generateUsageFromArguments(): string {
         let usageTemplate: string = "";
-        this.parameters.map((e) => {
-            usageTemplate += `[${e.name} (${e.type}${
-                e.optional ? ", optional" : ""
-            })] `;
-        });
+        this.parameters &&
+            this.parameters.map((e) => {
+                usageTemplate += `[${e.name} (${e.type}${
+                    e.optional ? ", optional" : ""
+                })] `;
+            });
         return usageTemplate;
     }
 }
diff --git a/src/CommandManager.ts b/src/CommandManager.ts
index b2cb91f..06a6fa3 100644
--- a/src/CommandManager.ts
+++ b/src/CommandManager.ts
@@ -32,33 +32,37 @@ export class CommandManager {
                     if (c.name == phrase) {
                         command = c;
                     }
-                    c.aliases.map((a) => {
-                        if (a == phrase) {
-                            command = c;
-                        }
-                    });
+                    c.aliases &&
+                        c.aliases.map((a) => {
+                            if (a == phrase) {
+                                command = c;
+                            }
+                        });
                     break;
                 case "NO_PREFIX":
-                    c.keywords.map((k) => {
-                        if (k == phrase) {
-                            command = c;
-                        }
-                    });
+                    c.keywords &&
+                        c.keywords.map((k) => {
+                            if (k == phrase) {
+                                command = c;
+                            }
+                        });
                     break;
                 case "ALL":
                     if (c.name == phrase) {
                         command = c;
                     }
-                    c.aliases.map((a) => {
-                        if (a == phrase) {
-                            command = c;
-                        }
-                    });
-                    c.keywords.map((k) => {
-                        if (k == phrase) {
-                            command = c;
-                        }
-                    });
+                    c.aliases &&
+                        c.aliases.map((a) => {
+                            if (a == phrase) {
+                                command = c;
+                            }
+                        });
+                    c.keywords &&
+                        c.keywords.map((k) => {
+                            if (k == phrase) {
+                                command = c;
+                            }
+                        });
                     break;
             }
         });
@@ -82,25 +86,27 @@ export class CommandManager {
                     `The name "${command.name}" has already been registered as ${nameOccurrence.type} in the "${nameOccurrence.command.name}" command.`
                 );
             }
-            command.aliases.map((a, i, ar) => {
-                const aliasOccurrence: PhraseOccurrenceData | null =
-                    this.findPhraseOccurrence(a);
-                if (aliasOccurrence) {
-                    console.warn(
-                        `[⚠ WARN] The name "${a}" is already registered as ${aliasOccurrence.type} in the "${aliasOccurrence.command.name}" command. It will be removed from the "${command.name}" command.`
-                    );
-                    ar.splice(i, 1);
-                }
-            });
-            this.list.map((c) => {
-                command.keywords.map((k, i, a) => {
-                    if (c.keywords.indexOf(k) != -1) {
+            command.aliases &&
+                command.aliases.map((a, i, ar) => {
+                    const aliasOccurrence: PhraseOccurrenceData | null =
+                        this.findPhraseOccurrence(a);
+                    if (aliasOccurrence) {
                         console.warn(
-                            `[⚠ WARN] The name "${k}" is already a registered KEYWORD for the "${c.name}" command. It will be removed from the "${command.name}" command`
+                            `[⚠ WARN] The name "${a}" is already registered as ${aliasOccurrence.type} in the "${aliasOccurrence.command.name}" command. It will be removed from the "${command.name}" command.`
                         );
-                        a.splice(i, 1);
+                        ar.splice(i, 1);
                     }
                 });
+            this.list.map((c) => {
+                command.keywords &&
+                    command.keywords.map((k, i, a) => {
+                        if (c.keywords && c.keywords.indexOf(k) != -1) {
+                            console.warn(
+                                `[⚠ WARN] The name "${k}" is already a registered KEYWORD for the "${c.name}" command. It will be removed from the "${command.name}" command`
+                            );
+                            a.splice(i, 1);
+                        }
+                    });
             });
             this.list.push(command);
             return true;
@@ -159,7 +165,7 @@ export class CommandManager {
                     command: c,
                     type: "NAME",
                 };
-            } else if (c.aliases.indexOf(phrase || "") != -1) {
+            } else if (c.aliases && c.aliases.indexOf(phrase || "") != -1) {
                 returnValue = {
                     command: c,
                     type: "ALIAS",
diff --git a/src/Help.ts b/src/Help.ts
index b315a94..5fd799e 100644
--- a/src/Help.ts
+++ b/src/Help.ts
@@ -16,7 +16,7 @@ export class HelpMessage extends Command {
             description: params.description,
             parameters: [
                 {
-                    name: "Command name",
+                    name: "command_name",
                     description:
                         "Name of the command that you want to get details about",
                     optional: true,
@@ -45,7 +45,10 @@ export class HelpMessage extends Command {
                                     `${cmdManager.prefix}${cmd.name} ${cmd.usage}`,
                                     false
                                 );
-                            if (cmd.permissions.toArray(false).length > 0) {
+                            if (
+                                cmd.permissions &&
+                                cmd.permissions.toArray(false).length > 0
+                            ) {
                                 let permList: string = "";
                                 cmd.permissions.toArray(false).map((p) => {
                                     permList += p + "\n";
@@ -56,14 +59,14 @@ export class HelpMessage extends Command {
                                     false
                                 );
                             }
-                            if (cmd.aliases.length > 0) {
+                            if (cmd.aliases && cmd.aliases.length > 0) {
                                 let aList: string = "";
                                 cmd.aliases.map((a) => {
                                     aList += a + "\n";
                                 });
                                 helpMsg.addField("Aliases:", aList, false);
                             }
-                            if (cmd.keywords.length > 0) {
+                            if (cmd.keywords && cmd.keywords.length > 0) {
                                 let kwrdList: string = "";
                                 cmd.keywords.map((k) => {
                                     kwrdList += k + "\n";
diff --git a/src/Parameter.ts b/src/Parameter.ts
index 8f649ca..554e08a 100644
--- a/src/Parameter.ts
+++ b/src/Parameter.ts
@@ -1,35 +1,35 @@
 import { ParameterType, ParameterResolvable, Choice } from "./types.js";
-export interface Parameter {
+export interface ParameterSchema {
     name: string;
     description?: string;
     optional: boolean;
     type: ParameterType;
     choices?: Choice[];
 }
-export const ProcessArgument = (
-    a: string,
-    type: ParameterType
-): ParameterResolvable => {
-    switch (type) {
-        /* case "TEXT":
-            return a;
-        case "NUMBER":
-            const numF = parseFloat(a);
-            if (isNaN(numF)) {
-                throw new ParameterTypeError(a, type);
-            } else {
-                return numF;
-            }
-        case "TRUE/FALSE":
-            if (a.toLowerCase() == "true") {
-                return true;
-            } else if (a.toLowerCase() == "false") {
-                return false;
-            } else {
-                throw new ParameterTypeError(a, type);
-            }*/
-        default:
-            return a;
-        //throw new TypeError("Invalied type specified");
+export class Parameter {
+    name: string;
+    description: string;
+    optional: boolean;
+    type: ParameterType;
+    choices?: Choice[];
+
+    constructor(options: ParameterSchema) {
+        this.name = options.name;
+        this.description = options.description || "No description";
+        this.optional = options.optional;
+        this.type = options.type;
+        this.choices = options.choices;
+        if (!/^[\w-]{1,32}$/.test(this.name)) {
+            throw new Error(
+                `Parameter name ${this.name} doesn't match the pattern`
+            );
+        }
+        if (this.description.length > 100) {
+            throw new Error(`Parameter ${this.name}: Description too long`);
+        }
+        return;
     }
-};
+    static process(a: string, type: ParameterType): ParameterResolvable {
+        return a;
+    }
+}
diff --git a/src/types.ts b/src/types.ts
index 8086ade..5633a7d 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -8,7 +8,7 @@ import {
     TextChannel,
     VoiceChannel,
 } from "discord.js";
-import { Parameter } from "./Parameter.js";
+import { ParameterSchema } from "./Parameter.js";
 import { PermissionResolvable, Message, MessageEmbed } from "discord.js";
 import type { Command } from "./Command.js";
 
@@ -24,7 +24,7 @@ export type GetMode = "ALL" | "PREFIX" | "NO_PREFIX";
 export type PermissionCheckTypes = "ALL" | "ANY";
 export interface CommandBuilder {
     name: string;
-    parameters?: Parameter[];
+    parameters?: ParameterSchema[];
     aliases?: string[] | string;
     keywords?: string[] | string;
     description?: string;