Where can I find some tips?

When I tried out for the basketball team this year I didn’t make it, and I really want to play. I have been working on my basketball skills as much as possible. However, I haven’t been able to find a way to increase vertical jump height yet, so I was wondering if anyone knew of a book or a website that would give me some tips or a routine that I could use to try to improve my jumping skills. I think that would really help out my game since right now I really can’t jump very high so I can’t slam dunk the ball.