Most kids start holding the club with a baseball grip, which does not allow for control at the top of the backswing; try this hot dog in a bun routine for getting a good grip
The best way to read greens is through experience, I like to take eight balls and roll them to a hole at different speeds and on different lines, then with the eighth ball I putt it by picking the best speed and line to get the ball in the hole
You can either set up to a bunker shot square to the target for a lower trajectory and more roll or open to the target line with your clubface at the target for a higher trajectory and softer landing