Some great advice so far, I'll just add this recommendation: build a pizza box flier. It may sound corny, but they're cheap, "Lock in", use very little fuel, you can fly em in close, and the best part is you can stuff em in to the ground unbelievably hard. The worst that usually happens is a broken prop. You'll spend some money on props, but you will learn how to hover cheaper than anything else I've seen, and have a blast doing it.