Newbie to Active directory - Domain - Trees - Forests?

I am newbie have an NT Server with a single domain called NTDOMAIN and Exch5.5 working fine.   In order to upgrade to Exch2000 I need to setup Active Directory on the network.

I took another server and installed W2KAdvServer and created a new Domain? called W2KSERV using Active Directory.  (well I say Domain because it looks like a domain to NT)

Is this a domain - a tree or a forest - I am new to active directory
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JConchieConnect With a Mentor Commented:
while studying, pay a large amount of attention to is critical to AD.
It is the root domain........and the only one at this point in your AD forest........and probably the only one you will need.

I would suggest that you do some serious reading before you get yourself into a world of trouble.  A google on active directory or active directory basics will yield a wealth of info, for instance:
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