if it is the white one, the wii classic controller, that only works with those virtual download games thing, which you pay with wii points. maybe also for wiiware or for some games, but didnt see any so far. i think it would say that the game is available to play with it on the back of the cover, but as far as i know its only for virtual console games. and the gamecube controller, just take the upperside of ur wii and you can open it, there are 4 spots u can plug in ur controller.
sorry for bad english, hope i helped