Envision the club you would use if the lie were flat. If the uphill is not too extreme take one club stronger than if the lie was level; 2 clubs more if the lie is extreme. Remember to tilt your shoulders at the same angle as the slope and focus on the top of the flagstick. As with any unusual lie take several practice swings; swing path should parallel the slope. Ball will not roll out as much as usual. Also, good luck.