Should I do a Child Domain or just a Domain

Hi,

I would suggest to add as a child domain. Create a new child domain when you want to create a domain that shares a contiguous namespace with one or more domains. This means that the name of the new domain contains the full name of the parent domain. For example, sales.microsoft.com would be a child domain of microsoft.com. As a best practice, you create new domains as children of the forest root domain.

You can use this procedure http://technet.microsoft.com/en-us/library/cc787706(v=ws.10).aspx.

Hope this helps

One Forest and One Domain is the best option here. So answer to your query is add it as additional server. I don't see any use of creating child domain.

Does anyone have any good step by step on adding a server to a domain as a member?

you add the server to the domain the same way you add a workstation.
It is only if you want to share roles that it gets a little more complicated.

you also need to watch out for dhcp and dns between the two sites but really that is another question.

Thanks guys....