The best way to learn to do this is to practice with a pitching wedge and swing it back until your left arm and golf club form an angle that would represent the letter 'L.' In this position your left arm would be horizontal and the golf shaft vertical-although it would point towards the target line.
This teamed with the amount of time you put in on the practice tee and on the course will have you in golf shape in no time. Swinging a golf club is a much more strenuous act than most think and if you have never used those muscles you are going to be sore after you play.
I like to bring protein bars and a bag of nuts - this really helps to keep me fueled throughout the round. If you're riding in a cart, it's easy to stuff your snacks in the front compartment so you'll remember to snack often.
If you're picking your first golf set, you don't need to pick one club of every kind available. As a beginner you should probably start out with a wedge, putter, driver and iron. You don't need more than one of each kind. As you get some experience and see what kind of golf player you are. You'll notice what kind of clubs to expand your golf set with.
The two things that most golfers have issues with the most is their backs and their wrists. More golfers have injuries to these parts of their body than to other parts of the body. This means that you need a fitness program that will help to build a core to support your lower and upper back and a program that will strengthen the muscles and tendons around your wrists.
Another tip is to drink plenty of water prior to starting your round. Drinking water optimizes muscle performance and helps digestion while playing. Don't overlook this one! Dehydration can cause muscle weakness, cramping, and energy loss - and you don't even know why you feel so tired. Often its due to dehydration. Once you start playing, you should continue drinking water at every hole.