Networking

I work in a tier 1 position and my boss wants me to take the computers in our lab and network them off one pc that is connected to the network here. We have 4 pc’s in our lab—win98, winxp, macos9, and win2000. I was wondering what would be the best way to go about this. I was thinking of running 3 of them off of one pc that is connected to the network from a hub or a switch. Also, I was wondering which one of them to use as the main pc to branch off of and how to configure it to send the packets to the other pc’s. Thank you….Mike