Hi Angie,
I would suggest that you review the basics of starting a business in
the Start Up Guide section of FloridaSmallBusiness.com. The
information under the heading "Legal Structure" will explain about
setting up a corporation, sole proprietorship or other form of
business. (There is more detail on this further down on the site under
the heading dba Florida.)
http://www.floridatrend.com/small_biz.asp
As for purchasing a web domain name, there are a large number of sites
that sell names and, in some cases, web hosting and other services.
Domain names typically cost $9.99 a year to $34.99 a year. Here are a
few:
http://www.networksolutions.com/
http://www.godaddy.com/gdshop/default.asp
http://smallbusiness.yahoo.com/domains/
If the name you want is not available, there are resale marketplaces
for domain names. Here's one based in Florida.
http://www.afternic.com/
Good Luck!
Barbara Miracle
Editor
FloridaSmallBusiness.com