Re: Handling the ball?
The best way to increase ball control is definitely two ball dribbling, just pound the ball ~100 times a day in your warmup. Other dribbling drills are good but two ball dribbling increases your control the most. As to why you're making so many turnovers, I think its just game experience. When I got cut from my high school team freshman year, I practiced 2-3 hours every day until my school's summer basketball program. However, I didn't get to play any games because my outside team ended in eigth grade, so when I played my first 5 games or so I was always in a rush to get rid of the ball and always threw it away, but in the most recent tournament I calmed down a bit and did a lot better.