Lil'Wayne

Question About Buying video Games For Nintendo Wii?

I just bought a Wii and I am new to using the Wii to buy video games.

#1 Is it legal to use the Wii to buy old video games for the Wii?

I found out that using the Wii on the internet I can buy Super Mario 64 for the Wii as well as other games and I would like to buy that game if it is legal.

#2 If it is legal to buy the game and I buy the game will it be the full version of the game just like it would be when I played Super Mario 64 on Nintendo 64?

#3 If it is not legal please tell me why so I know not to buy the game or any other games through the Wii internet.

If it is legal to buy Super Mario 64 will I need to buy a Gamecube controller or a wii controller or can I just use the Wii remote that came with my Wii system?