You need to purchase a standard controller for the Wii. Its basicly a regular controller that hooks into your wiimote to allow you to play regular games. I think you will find though that the wiimote makes an easier play expierience
Question about the Wii controller. Is it possible to play a game on the Wii without the motion functionality? Say I just want to sit on the couch after work and don't want to move anything but my fingers. To be honest, the motion features just don't catch my fancy, but the console's price does!