Cornerback/Safety.....SPEED TIPS

Hi....

I am a jr looking to start next year for my varsity team. I am about 5'9'' 165-170 lbs.
I have a pretty good vertical probably around 32 inches + and run like a 4.89 40.....as u can see i need some help. I would like to know what workouts i can do to improve my vertical as well as my 40 times. (I usually have to jump off 2 feet) i dont know if there are workouts specific to learning how to jump off 1? PLEASE if someone could hook up a workout and some ways to achieve my goals by next august......

Goals
40 time- (4.70)
Vertical (35+)
Bench (250) .....right now i do 235.....

THANKS!