setting up a server

im planning on setting up 8 xbox 360’s, and 10 pc’s. what i would like to do is run all the connections from the xbox’s and pc’s to the server. the server will be connected to the internet, the pc’s and xbox’s will connect to the internet through the server, im using imperium 1481 tower server, with windows small business server 2008, using ethernet cabling, what type of hardware do i need? a hub? switch? also would like to hook a pc to the server with administrator powers.