It isn't as much the size of the cheerleader that determines if they're a flier, they just need to be the most flexible girls. One flyer at my school is taller than some of the bases. That being said, you need to be small enough to be lifted. 5'2" and below is a good height but it you're taller you still have a chance if you're flexible. As for weight, you just need a relatively flat stomach. If you're a little heavier that's okay because you might have more muscle, which is more important than weight. Good luck.