How do you get new karts and tracks on mario kart ds?

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I would like 2 know how to get tracks on multiplayer and get more people and karts for single and multi player. I also need cheats for mario kart and the following:
mario party ds
super mario 64 ds
indiana jones lego ds
diamond version ds
madden 09 ds
asphalt urban gt 2 ds
prince caspian ds
shaun white ds

How do you get new karts and tracks on mario kart ds?

Tags: mario kart ds, kart, single, multiplayer, mario 64 ds, Mario, indiana jones