Golf is a complicated game under the best of circumstances, especially in the beginning when a golfer is trying to learn the basics of a good swing and then take the time to practice those basics. It gets a lot more complicated for left-handed golfers, who may have to take instructions for right-handed golfers and reverse them. That only makes a tough game more difficult to master. This is especially true of the backswing.
Stand on the right side of the ball. If you want to hit a shot that goes straight, you must square your shoulder to the target. That means your right shoulder should be facing the green or the spot on the fairway you want the ball to to go.
Look down at your right foot. It should be directly under your right shoulder. If it is angled in any direction, change the angle so your front foot is parallel to your back foot and perpendicular to the target.
Prepare you grip correctly. Look down at your right hand. You should be able to see a letter "V" between your right thumb and your right finger. If you cannot see the "V," rotate your hand to the right, and it should become more prominent.
Rotate your hips to the left to begin your backswing. As your body turns, bring your hands back. When you have turned as far as you can to your left, your hands should be at shoulder height.
Do not rush your backswing. Your club will do the work in propelling the ball down the fairway. Rushing your backswing almost always leads to poor timing and mishitting the ball.
Tips & Warnings
Go to the driving range and practice setting up your shot and your takeaway.