your gonna need a slot card first(a card that looks identical to a normal ds game cartridge, but has a slot for a micro sd card). I recomend R4 or M3 because they seem to be the best in the market. There are heaps of stores if you look around, i live in australia so the store i used wont help, but try and get one that will sell you a japanese imported kingston micro sd as they work best. There are various guides here but basically you need to search google for things like NDS Homebrew and NDS Homebrew Emulators. That should bring up alot of the info you need.
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