Brain freeze on the flash card

Hi, can anyone give me advice on these flash cards? Complete newbie. Kids have nds, what do i do to flash a card with games, where do i start, what do i need, and how do i get it?

 

heres a good place for info http://en.wikipedia.org/wiki/Nintendo_DS_storage_devices

 

Thanks a mil, what would you recommend and where's the best place to get it?
Thanking you in advance

 

My Apologies..

 

Thanks for the response,
Do I need a card reader/writer with these, still a bit confused on what to do, do i need to flash firmware or are these card s pre-programed, where can i get downloads?

 

Got caught up in the excitement of helping me out. lol

 

I've ordered a super ds one, will let you know how i get on
Thanks again for your help.