On any full shot, swing at no more than 75% to 80% of your max (you actually should do this all the time). When you get to the first tee hit whatever club you feel the most confident will get you in the fairway.
One of the problems with drivers today is that in an effort to maximize distance, manufacturers have increased their average length from 43 inches to around a standard length of 46 inches, which makes them difficult to control. As talented as they are, tour players use drivers only 44 ½ inches. Actually, a well hit 3 wood will go farther than a miss-hit driver and much straighter. When you get to your next shot do not try to reach the green. Once again hit whatever club you feel most confident in that will get you within an easy pitch or chip to the flag. Aim for a spot that will allow you to have a clear pitch or chip without dealing with bunkers. On your third shot do not go for the pin unless it is near the center of the green. Hit the ball in the middle of the green. Never try to hit over a sand trap if it you can possibly avoided it. Follow the same plan for par threes and par fives.