You throw your right shoulder out to start the downswing. The right shoulder should go down not over and out. That's the reason you slice. You're coming over the top and cutting across the ball.

There's a thread a few down that covers the same topic: http://www.golf-tuition-online.com/g...in-dswing.html (right shoulder works under chin on dswing)

Get that right shoulder going down and through and think of hitting the ball out to right field. That should get you going in the right direction.