Firstly! Create an account, if you haven't already. This account is 'not' the account you will post with on anything other than the OOC forums. This account is the name you want to have tied to your chatbox name and one people will recognize you as. You will then create more accounts named as your characters which you will switch to for posting under. Your accounts may all share one email, it is also possible to make up an unreal email, however do this with caution as if it is a real email then someone can easily delete all you have done here.
Once you've completed reading all of the handbook you'll be ready to make your first character. While logged in on a character in the profile section you may link your profile back to your super account and vice versa so you can easily see who has which characters and who to contact in the C'box concerning anything related to his/her characters. It may be easiest to set just 1 password per all accounts for help with remembering credentials for all characters.