Draw a dot on the center of your clubface. Concentrate on putting that dot on the back of the ball, and you'll make great shots.
To get great results on the golf course, focus on impact and follow-through, not your backswing.
Be consistent with your tempo. Make a swing with your favorite iron, find your tempo, and then use the same with your driver.
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.