Next step is buying a hosting, go with hostgator shared hosting plan. change your domain nameservers after you sign up with hosting, upload files with ftp and start working on your files.
Check the Hosting category in Domainers Directory (see signature) to find several hosting providers. You will find there some other interesting links if you plan to further develop your website.
You would do well to detail out your requirements in order to select a perfect hosting plan for you to suit you and your budget. There are several good hosting companies offering excellent plans and I guess you would face the the 'problem of plenty' in this segment! Regards, RightMan
If you are new, go for some free hosting....try your hands out for 1-2 months...then if you feel that you want to be big then buy a host...not before that.... for free hosts you can try searching on google "free web host" there you will get 100000s of free host...try it first before buying a host.....