Hi,
> do i need a folder for the games - no, just place the nds files in the root of the card and it will work fine

> how many games on a 8gb card - depends on size of the nds files (anywhere between 32mb and 250mb). so put on as many as you like, just leave some space for the system to create save files in games.

> File name too long - I usually delete the file numbers and rename to a short name (makes it easier to find in list also)

Hope that helps