This is a little drill my coach showed me at the begining which helped me no end.

1) make sure your right hand is wrapped over your left thumb so that you can just see the first two knuckles on right hand when you address the ball.

2) Now stand at 45 degrees to the direction you wish to hit ball.

3) Setup to hit ball in direction you want, this will feel very wierd as the ball will be just insde left foot buut your right foot will be a sholder width back and away from ball.

4) Now do the normal swing but aim in the direction you wish to go. This will bring you hands over and around your body conteracting any slice and making you roll your hands.

5) Now gradually over a number of swings bring your right foot back in. Hopfully you should be swinging with your hands turning over slightly and finishing down the line with club toe pointing upwards.

6) this is a basic drill for beginners and will not improve a better players swing.