Have you heard of Kelly Blaggett's Vertical Jump Bible? It is like a $30 book but if you really want to get better I am sure it would help you. It has programs and exercises for quite a few difficulty levels and needs.
As to what you could do now, I would just do basics - depth drops off a box, depth jumps off a box (3 sets of 2 of each?), and leave the lunge and jump patterns for when you're a more advanced trainee. It's easy to overtrain with plyometrics, so it might feel easier than it really is at first, then you can ramp it up some.