Work on jumps, lead outs, fast pace riding and standing starts. Eventually work on track stands (start on the straights) but that can wait a bit. I'd also focus early efforts on finding your best position on the bike for high cadence/power. This may involve some saddle adjustment and bar/stem adjustment.
Also work on bike handling skills. The varied types of races like miss and outs, etc. require really good bike handling. Practice slowing down with only the pedals, and if you're into sprinting, learn to brake with one hand rubbing the front tire. It's not used that often, but it's an invaluable skill.