Driver posture is critical because if you are out of balance or if your posture is off, it will be difficult to create much speed or control. Start with the correct grip, and set up with the ball off your left foot. The object is that you are trying to catch the ball slightly on the upswing.
As far as weight goes, you have more force in your right foot because when you swing, you go left to push back to the right. Set up to the ball like taking a bow, and bend from your hips. When you set up, you push your hips back. Your knees should be just over your ankles. When your hips are relaxed, you have the most amount of flexibility. Posture is a big key to hitting your driver well.