Here are some the key points to remember:
Find the right grip. The grip may have more to do with ball flight than any other aspect. Everyone's golf grip is slightly different and you have to find your own grip.
If you're hitting golf balls to the right than you should try rotating your hands clockwise on the callaway diablo edge irons so that you can see 3 knuckles on your left hand. You should also try gripping the golf club with less pressure, try holding it very gently. These adjustments will encourage the club face to close earlier in your swing.
If you're hitting golf balls to the left than you should try rotating your hands counter-clockwise so that you can only see 1 or possibly no knuckles on your left hand. You could also try gripping the club a little tighter. These adjustments will delay the club face from closing in your swing.
Rotate your body, don't rely on your arms. Keep your back straight at address and make sure you're bending from the hips, not the waist. Rotate your shoulders back from your spine, moving your arms back as a unit with your shoulders. Your right elbow should be bent and tucked in by your ribs, and your left arm should be extended across the top of your chest. With diablo edge irons you can sometimes get away with less rotation and more arm power, but you won't be able to control the 'big dog' like that. Rotation is a very important when learning how to hit a driver straight. Golfers who lift their arms too high in the air tend to have golf swing plane that is way too steep and usually results in the big banana slice!
Think about how your hands roll over in your golf swing. As you swing, your right hand and forearm should roll over your left. Players who don't roll their hands over soon enough tend to hit the ball right. Those who roll them over too early will hit hooks. Either way you'll be all over the golf course. Work on your timing and try to roll your hands over smoothly and evenly. The idea is to time it so that they're pretty square at impact (like they were at set-up) or slightly rolled over, depending on the individual.