It is easier to just ask someone...in many peoples minds.
Elementos, congrats on your Wii purchase. Most Wii games will actually require having both the nunchuck and remote to play the game. But there are quite a few that do not. It is easiest to check the back of games before buying them, because it lists what controllers are required and even how many people can play at a time.
The biggest problem with this is sometimes games are in cases and you can't see the back. In that case I would do research online of any game you want to play. At this point it is easier to list the games that don't require the nunchuck to play.
Those include but are not limited to:
Super Monkey Ball
Wario Ware
Wii Sports
Virtual Console NES, TG16, and Genesis games (although many will play better with the classic controller)
Bust-A-Move Groove
Wii Play
Wow, I am having a hard time thinking of other remote only games at this time.