Not bad.
I could honestly see this on a fast pace flash animation or game that is submitted on newgrounds. The only weakness is it's shortness. I would recommend making it a bit longer and add a little variation in it. It sort of just got repetative, but as you said it was while you were learning how to use FL Studio. I hope to see your "greatest work" sometime.
- GS -
C52
Newgrounds Mafia.