Well first off, I don't jump to fly. I just start flying. At first you will probably float as thats easier. Don't be discouraged if you can only go so high (if its 20 feet or whatever). Just be comfortable with maintaining that height. You might start drifting down but don't let that kill your confidence. I find its important to concentrate on my head and not my whole body. Your body will follow your head. The big thing is to stay calm the whole time. If you are relaxed it is easier. Then with practice you will get better at it.