[edubuntu] Server Type Advice

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http://ubuntuforums.org – Please, please forgive my lack of tech know-how in advance. My background is actually in animation, but I'm trying very hard to learn. I am a teacher at little school with no tech budget (aren't they all). I have a lab consisting of 25 Dell Hybrids, 4 MSI netbooks, and a custom built server machine. These machines are used by kindergarten through eighth grade students. My lab machines are currently being upgraded to Edubuntu 12.04. The issue is the server. I'm not sure what type of server to attempt to set up. We have a closed classroom network with a line in from the ISP. Its (Hardware)