Start by going to the Discord developer portal. Create a new application by clicking New Application. Give it a name like Project Zombot and agree to the terms.
Copy the Application ID and Public Key; you'll put these values into your bot configuration.
Next, go to the Bot tab in the sidebar and click Add Bot to add a bot user. Click Reset Token and copy the token Discord generates; you'll also use this value when configuring the bot.
Now you can continue on with deploying the bot.