Default [Q] Wiped and formatted SD Card. Needed files for Android?

Ok so I wiped and formatted my SD Card to FAT32. I am in the reboot/recovery screen of my android with ClockworkMod and I noticed when I turned on USB Mass Storage, the SD Card is readable but there is nothing on it now. Is there any important files I am going to need to put on the SD Card for my android to function correctly on start up/running? Or will my android automatically put the correct files on the SD Card on boot? Haven't tried booting it yet lol..don't want to screw it up.