you've got plesk as your admin panel.
from it you can set up your domain:
create a client,
attribute a domain to this client (your domain name)
setup a database
create the admin account for the database users
activate the ip address of your server,
create email accounts (eg:
[email protected])
plesk is not hard to use since they have improved the panel over the time.
there are plenty of tutorials on swsoft website that ksl gave you.
otherwise jsut try : "plesk flash tutorial" or "plesk walkthrough" etcetc (be imaginative) and you'll find a wealth of info available for free.
by the way: you rent plesk for $5 a month that's one thing. 99% of the time that means you are running a dedicated server.
Are you sure this is the best choice?