first thing of course is make sure you are getting all your daily requirements to be healthy.
when i used to sprint we did a lot of interval running. we'd start by running 1 mile a a warmup and then run 1/4 mile at a easy jog and then sprint the next 1/4 mile repeated many times.
not sure what kind of shape your in for running, but stairs, squats are also helpful in preparing for sprints. Be sure you have a good calf workout too so you don't get shin splints.
practice your sprints as well being sure to walk a lap or two and then go again.
good luck
Need a workout for sprinting 
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