Staying behind the golf ball is very important to the stability and consistency of your swing. There is no need to overdo this idea, but I will give you some simple steps that will help.
Set up- when you grip the golf club, lower your right shoulder so that your left arm is above your right. It will happen naturally when you grip the club. This will trigger a set up, and remember to keep your ball position more in the center of your stance. I like to think of it lined up with the bellybutton or belt buckle. Your spine should be tilted to the right.
Next is your backswing. You don't want to move away from the golf ball, you want to rotate. Put the weight of your chest over your right foot, and get behind the golf ball with your shoulders- the left shoulder blade should rotate behind the golf ball. The keyword is PIVOT, not sway.
A lot of players hang back, creating a reverse pivot. This is also considered the reverse C, and what you want is a reverse K. Once you've made the pivot from the upper body, creating your reverse K, on your downswing continue to stay behind the golf ball, then once you strike the golf ball follow through on to your left side. Make sure that your right foot is off the ground, and you are standing more upright.
Make sure to hold your finish as long as possible. If you were to move in front of the golf ball, you would then be in the land to chunk the ball, or pinch it too soon. The moral of the story, is to stay behind the ball, don't get too eager, and swing through holding your finish!