Controlling distance out of a bunker can be done in many ways, try all these methods and see which one works best for you
Control the direction of your putt before you hit it and control distance by using this simple drill
Using a piece of string with tees attached to both ends is the best set up and alignment tool you can have, put it in the ground to represent your target line then use it to square your clubface, align your body to the target line and maintain a constant ball position