Your Golf Grip
First, take your normal stance and grip. From that position, simply hinge the club vertically with your wrists without moving your arms or shoulders, until the club head is in line with your hands straight in front of your body, parallel to the ground. If the toe is not pointing directly to the sky, your grip is not square from the start, and you need a refresher.
To fix this grip issue, review the drawings from Hogan’s book of the Five Fundamentals on grip, and move your grip to get more in these positions. If by chance you do not own this book, then I would highly recommend you visit your neighborhood bookstore and pick one up directly.
When you have gotten your grip to look more like Hogan’s, you will be able to do the above drill and have the club come up with the toe pointed at the sky. Once the club is in front of your hands and pointed at the sky, simply use your left shoulder to coil into your backswing from that postion. From there, you should be in a great position to swing back through the hitting zone with a square clubface. If you’re using your lower body correctly to initiate and lead the downswing, you will see a really, really straight ball come off your club.
Repeat a few times, and then start back in your normal address position. You can hinge the club up as part of your pre-shot routine to see that it is indeed still square, and then back down to begin your swing. Or, you can do what several pros have done for entire rounds, when their wrists were sore or injured– play the whole round using the drill, and starting with the club right out in front of your hands.
Sounds easy, but without a square club head at address you will simply be fighting your body to make solid contact. Better to start square and use a more natural motion.