How do I delete my Apple ID account ?

Review this support article that will show you how you can delete your Apple ID account. You will want to make sure you have signed out of your Apple ID on all of your devices or else you may never be able to log out on the device because the password to do that will no longer work.

Understand and control the personal information that you store with Apple - Apple Support

All of your data will be permanently removed, so make sure this is really something you want to do as there is no undo options, once it is gone.