Don't worry man i joined just for u (and other wii things

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1) Well i have a M3 simply and it works great. but u can't order it anymore because they have made a new card called M3 DS Real. Some people prefer the m3 simply though usually because they are used to it. there is also the R4 and i have its firmware on my m3 simply. there is also a cyclowiz DS card but i dont know anything about it. if ur looking for a cheap card then i guess is this
[Only Registered Users Can See Links. Click Here To Register]
although a while back it was 10 bucks cheaper.
2) you have to buy a microSD card and put the games on it, then u put the microSD card in the NDS card which then goes in your DS. you can find microSD cards anywhere. used mostly on phones. i have a sandisk 2.0GB and it works great on my m3 simply.
3) on emulation sites of course! sry pal cant say - rules >:P -