They usually give you a username and password so that you can log in to the web site and make your changes. When you buy a domain name, all you get are the rights to the domain name. Technically, you are leasing the domain name. Although you can lease a domain name for up to 10 years in advance, you can never permanently own a domain name. Should you ever forget to pay the bill, your domain name will slip back into the pool of available domain names, and someone else can snatch it from you.
Domain names can only consist of letters, numbers and the dash.
Try to pick something short and sweet something catchy. Unfortunately, other bands, companies, and stooopid people called cyber-squatters who purchase tons of domain names at a so that they can sell them to someone else for a few hundred or even a few hundred thousand dollars have already snatched most of the good domain names up. If your finding it hard to find a decent domain name. Some smart fellas bought the domains surf.to , go.to and listen.to and made them available for people to use. Lots of people like to use these domains, but I personally think that they suck for two reasons.