Straight Right Punch
From your stance, let the right hand start to come out. Now, as with any punch, the fist should lead the punch, but almost simultaneously, your right hip should begin torquing in a counter-clockwise motion. As the punch continues straight out to a full extension, which means your arm will straighten out, the shoulder should automatically follow the punch. The shoulder should never lead the punch. At the end of the punch, your rear heal should be slightly turned out. This shows that you torqued your hips properly.