Network boot Mac to linux

So i am prepareing to set-up ubuntu (non-ppc) server...i think 6.06. The purpose is to setup an real time streaming server (rtss) and also to manage all files on one location. So i need the server kinda like this if i am describing it correctly. Part of the server access the internet for RTSS purposes. The other part is for students at a school to login to. The room has 5-7 workstations with 3 computers at each. each computer has to be able to log in to their work station. (for example if 3 of us are @ workstation 3 we each need to be able to access the server with the same users & passwords). Also there are programs (like Garage Band or final cut) that need to be accessed per workstation but they are mac specific. so how do I handle that as well. Please give me the full setup (eg what to install how to do it) and what equipment is recomended.

PS the box was originally WIN2k but now contains formated blank hard drive. Also has network card pre-installed. I promise to follow each direction carefully.