It's hard to make solid contact if your weight is on your toes or heels. For the right feel, pretend you're just standing and chatting with a friend. Notice how your weight settles between your heels and the balls of your feet? That's where you want it at address. You'll make a full, on-plane swing and stay balanced.
Stand with your feet six inches apart, holding a club vertically in front of you. Now relax. Your weight will go to the middle of each foot. Lower the club to the ground and take your setup, maintaining that sensation in your feet.