To deliver the club correctly on the downswing you must first learn the three arcs of the backswing so that you get your club in the correct position at the top
Learn to take a divot in front of the ball by finding the three bottoms of your swing, fat shots are caused by using too much back arm and results in a swing bottom behind the ball
The position of the ball in your stance is determined by your swing shape and the club you are hitting. Your wedge should be near the center of your stance and your driver should be off your front heel.