Cheerleading tryouts, what more should I do?

Okay well I haven't done cheerleading sense I was 9 and I took dance for 3 years in elementary school. But now I want to tryout for cheerleading this year (sophmore) and I'm not sure what I should do to train... I can do perfect cartwheels and round-offs but my jumps need some work and I'm just nervous that my lack of experience is going to affect what they think. I'm starting to work out my abs and having my cousin run with me but what more should I do?