Walkerk,
Dont take this the wrong way, but are you good enough to be worrying about shaping the ball?? Unless you are category one (5 handicap or less) you want to concentrate on hitting the ball the same shape everytime. Its a bit to do with course management, if you know your shot you can place it in the best position to play your stock shot into the green. Trying to play different types of shots can lead to swing problems, besides
clubs and balls arent made to do that as much these days so a ball struck correctly for a cut may still go straight through no fault of your own, so you try harder next time and end up carving one out of the park.
Make sure you really need to be able to do this and then seek a pro to help you achieve it.
D.