Should be something like this:
Router connected to Internet => Hub/Switch => 6 Computers
Use Cat5 Network cable (RJ45) and the rest is common sense - just make sure there's enough to connect each device to each other without it stretching too much. If you went to school or college you'd probably notice the switches actually - big silver boxes with a load of network sockets and cables coming out of it. In our college they were shoved under the benches and desks where the computers were.