I'm not a drummer (i'm a guitarist), but one of my sons have a small kit. I think you should take Guy's advice: don't spend much money on the first kit. My son's kit is a good kit from a toy store (it's a real instrument though, not a toy like most kits you buy at toy stores.) As time goes by and it seems like the kid really enjoys it and probably is going to continue drumming, you can upgrade the kit, for instance buy a new and better kick drum pedal, then a high hat, a new snare and so on. Good luck!