I made alot of multiplayer posts
so i know this domain
if you want to make a multiplayer game you will need a server that will have to be open and a client that will connect to the server
You can find the Websocket ZackoWacko plugin in plugin section
And for the server , you can use now.Js (as used talkinghead)
But you will need scripting skills ) i am afraid i can't help you because i am not in university ( Sec 1 ;) ) so im not a js genius or a math but i hope this informations will help you