just started toying Windows 2008 Server Core installation, and found no place to go when I just got a cmd.exe at start (been too comforted in a GUI environment!!!).
actually there is a good start guide at TechNet site that covered most of the commands needs to configure a server core installation:
Server Core Installation Option of Windows Server 2008 Step-By-Step Guide
errrrrrrr... lots of commands needs to remember...