It comes with 1 wii-mote, 1 nun chuk to make everything needed for 1 player. I would recommend at least 1 more wii-mote, nun chuk combo. The wii is best used for 2 or more players, but it comes with everything you need out of the box.
Considering nintendo had an entire year to fill the demand for the wii and somehow didn't meet the demand this season, I would recommend calling places like gamestop and other video game stores to see if any came in and hope no one gets there before you. I called target daily to get mine early this year, and ended up getting lucky and finding one at gamestop.
They get boring after the novelty wears off and you realize nintendo only makes games for the 7-13 year old crowd.