Slope uphill.

Understanding ball position you need for this shot And the type of spin you want to make the shot a lot easier.

The right way to hold the club?

Slopes uphill, have the golf ball on the outside of the lead foot aligned with the vertical line of the golf club so when your club bounces of the ground it wont be stopped and ease into a swing. This type of shot has to be played with backspin. take a few rehearsal swings before each shot.