Yes, you can do an online game on NBA 2k13 Wii.
Yes
No the game is for Xbox 360, PS3, Wii, PC, & PSP
No
No just a wii nunchuc that plugs into the wii remote
You don't need the accessories, but there are attachments for the Wiimote that make it look like a tennis racket, a baseball bat, and a golf club.
You will need a game that has wifi campability.
Yes, the Wii Fit accessories are just add-ons.
There are a few wireless wii accessories out there, including the wireless wii headset and the wireless wii dancepad.
Not all Wii accessories are manufactures by Nintendo.
Yes there is a nba 2k10 game for wii!!!
A few of the most popular Wii accessories are the Wii remote controller, Wii wheel and the Wii perfect shot gun.