I'm Stuck In Domain Purgatory

This is ridiculous. I just signed up and I'm having trouble already. I'm trying to move my blog to my own domain name and had 2 or 3 names set up. After I set up the account it told me my domains were all taken. Now, I have a extra set-up for email that I don't need and I'm trying to get that deleted off of the acct. To top it off, I still don't have a domain name.