I know this is a bit late, but it's better than no response. Somebody else might see it and find it helpful.
The only things you'll NEED are included in the Wii: the Wii itself, cables to plug it in to the outlet and the tv, the wii sensor bar, a wiimote, and a nunchuck. Not every game uses the nunchuck, but there are a lot of games that require it. There is also a wii classic controller, which helps a great deal for some games, but isn't required unless you're playing virtual console games. It can also use Gamecube controllers for certain games, but there aren't any games that require one.