This is the simplest one I could find.
http://www.youtube.com/watch?v=xZ2HpOAOfbc
A short video shows how a coil, (which you can cover to make your wheel), can be made to spin. Things needed:- some small pieces of wood, some connection wire, a strong bar magnet, copper coil wire, a powerful battery source such as a power pack. It looks "doable".
If you cannot get that to work in any way try buying a "make your own motor" kit from a toy shop.
They have already sorted out how to overcome friction problems and make good connections.
I hope it works out for you. Regards - Ian