Download Project M to an SD card and pop that mug into your Wii, you'll be able to play it. Unfortunately I don't know where to download it haha, google it I guess.
I'm most proficient with Ness, I hardly use him anymore because I'm trying to become better with other players, but when I want to put the smackdown on someone, Ness is the homie. I'm not bad with anyone really. Maybe DK haha, but then again the N64 one only has 12 characters. What about you, whose your main? Any tournaments?