Have you ever watched any instructional DVD's? I have Gary Semics, Ryan Hughes, Shane Watts, Marty Smith, Jeremy McGrath and maybe a couple of more. While nothing can take the place of seat time, I think watching the pros on video over and over is a great way to improve your riding.
I think Ryan Hughes does the best job of explaining track jumps. He wears a microphone while he's riding and goes over all the steps. Not that the other DVD's are bad, but I think his is best for the track jumps. Good luck but be safe!