Instructions
Plug the Nunchuk controller into the Wii remote. The port is on the underside of the Wii remote.
Move the analog stick on the Nunchuk to move your character around in the game. In light-rail games -- games where your character automatically moves and your primary objective is to shoot -- this will move the camera.
Press the "C" and "Z" buttons to perform various actions. This will vary depending on the game you are playing, so check the controller options in your game for clarification.