Alright, I'll just bite my lip and answer this one...because I am extremely tired and I don't feel like referring people to instruction manuals.
Ok, yes. You can buy SSBM. It goes into the same disc slot that the wii games go into.
The controllers plug in on the top of the wii console...the long flap.
You will need a memory card, which plugs into the ports located under the next flap by the gamecube controller port. the short flap.
i think that covers it.