The area from 150 yards and in is called the scoring zone because by far the majority of golf shots come from inside that zone, so having good irons and working on this part of your game will have the greatest effect on your scores
If you are practicing and start hitting bad shots then step away from the ball and work on re-establishing solid contact with a few bump shots in order to get the feel for center clubface hits
Select your driver based on your swing speed, the slower your swing the more left necessary on your driver because straighter face clubs require more speed to get the ball to launch up into the air