To control trajectory, practice using a sand wedge to hit a low shot followed by a high shot. Play around and experience this same drill with other clubs.
Work on getting a stronger grip. Hold the club more in your fingers, left hand on top, and palms facing down.
If you are having trouble getting your hips out of the way and swinging over the top, this drill will help. Practice using different clubs.
Stand on your right foot, use your left toe to balance, and make a swing. This drill will help you feel how to put pressure into the ground and not jump off your right side.