Hello ZorMal,
E-mail accounts don't get connected to a single WoW character, but to the WoW account. If you are not sure about the user name of your account, you can always go and look it up at your e-mail, by checking the first message you received after creating the account, the one with the activation link.
If you figure out the user name, but not your password, you will be able to recover it once the server is live, and the database is in place, along with the website.
Hope this helps.