I believe the posture is essentially the same whether you are hitting a wedge or a driver. The only difference is the length and lie of the shaft which should naturally provide a different position at address. Golf clubs are intrinsically designed to aid the golfer.
The general rule is that the longer the club the wider the stance, whilst at the same time the ball position will gradually move forwards (towards the left heel for a r/hander) the longer the club. So that with a driver you have your widest stance and the ball position is opposite the left heel.
Just as important as posture is weight distributuon. Again, it should be quite natural, but for a driver the recommended weight is 60% on the right foot, which will assist transfering most of your weight over to the right foot during the backswing. I may be stating the 'bleeding obvious' and apologies if I am.