I started out by exaggerating and just throwing the ball end over end with no side turn at all. Not with a broken wrist, but keeping the wrist firm, kind of results in revving the ball "forward". Also, while you are doing that, keep the flat spot on top "inside joint" of your elbow facing the forward then the ceiling, try not to let it turn in and face your body, this will help you stay behind the ball and not have a flying elbow or "chicken winging".
After getting comfortable with that, while making sure to keep your elbow in the correct position (described above), allow your hand to rotate slightly, but never finish with your thumb pointing any left of 12:00 (assuming right handed). Be patient in your swing, it is hard to wait too long before turning the ball and easy to turn it early.
I hope this was more helpful than confusing. The big thing is to not be afraid to over-exaggerate, if it feels funny or "bad" you are probably doing the right thing.