i run the video game club at my high school but i am unfamiliar with how to hook systems up together.
i want to know this for general use and i want to before christmas break set up 4 360's together and get the club in on a 4vs4 gears of war game.

o and what would i need to buy and totaly how do i set it up

Ethernet cables and an ethernet hub or a router it you can use your router from home if you don't want to go out and buy anything. They will find each other, just set up a system link on one of the 360's and have the others search for a system link match.

Sorry forgot about the setup, plug the 4 ethernet cables into the 4 360's (1 each) and then plug all of the ethernet cables into the router/hub. and then do what I saud above.

Personally go spend a few dallars on like a 48 port router, that way u can have a mini lan party, with a bunch of people, or even a bigger router, depends on how many friends ya have.
or public lol hell invite em all!!!

go rent the VFW lol bring your own tv,, ( that might suck for them but hey )