Server 2003 and DNS setting

[Intrepid]

Hi, to start with i'd like to apologies if I placed this in the wrong section of the forum but I wasn't sure where to place it,

Right what I am wanting help with or more acurately advice about is name servers and dns settings and stuff like that,

Right let me explain what I am wanting to do, I am looking at setting up hosting for a buisness that I work for, to start with we arn't going to be hosting that much but they are wanting to do a small scale test to see if it is viable to expand this to a large system. So we are looking at getting 5 or 6 servers with windows server 2003 on them with processors of about 3500 AMD 64 bit, I am quite confidenet that I can set the sites up the servers and the networks and we are getting a leased line in with a sebnet of IP's so this isn't a problem, what I need to know is how to go about getting sites that are going to be on the servers registered, more specifically I need to know how to register domains and have them pointing at our servers IP address. I've been told to use a nameserver but I don't know which ones allow me to sign up and then specify and IP address where the site is hosted so I could really use this information.

Also could you advise me how many sites could be hosted on a computer with 3500AMD SEMPRON processors as I am looking for that information as well.

Hope someone can help

Thanx Rob