|Dear my Friend,|
Firs can i ask you something do you have a Domain Controller Machine ?
If you do not have this server build one,
if you have this i'll give you e short steps to join your server into the domain.
On the Windows 2003 server
right click at the My Computer icon and
click Properties, to open a System Properties page then
click Computer Name tab
click Change buton
on the Member Of area click Domain and write the domain name
click OK and you will be ask from the domain for User and Password this should be a domain user try the Domain Administrator Account
and you will get e message "Welcome to Domain"
after this click OK restart the server and your are joined into the domain now.
hope to helpfull this solution
and sorry for my English ^_^