You're 17... and your assignment was to get a LAN running? Don't they know everything about "PC Repair" can be found by pressing F1 or looking it up on the internet?
Anyway... it depends on your time constraints. Less time = smaller map. If you have all the time in the world Continental Divide is pretty dumb/fun. Otherwise something like BGH should be fine for your purposes.
These look pretty fun:
http://www.panschk.de/mappage/comments.php?mapid=1282http://www.panschk.de/mappage/(5)Sungaze%201.1(n).scmThe comments and ratings are based on 1v1. For a FFA with people who probably don't know StarCraft that well it should be fine.
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lol. those links are pretty fun. TC, your so lucky! my school is filled of nazis. they wouldnt ever let us play games. they don't even let us talk about it