Drawing people is just like drawing anything else, start with simple shapes and draw the details later. There are allot of rules to use when keeping people looking proportionate, like the average person is 6-7 heads tall, and other ratios like that. My goal here will not be to teach you that, but rather to let you observe my method, and then let you go practice it by drawing your own people. You should always practice by drawing from life, that way you can see how the shapes relate, which muscles are relaxed and which ones are tense, how people hold their weight when they stand, etc.
First let's look at the entire figure, and my basic process for drawing it:
You will notice that I start with a basic stick-figure drawing. Don't be afraid to draw something silly, it will make is easier in the long run. Remember, simple! After I have established the pose of the figure I ad some shapes to see where the areas of mass are, and make sure they look proportionately correct. Then you can start adding the details. You will also notice that the woman's figure is very similar to the man's. The main differences are that the shoulders are more narrow, and the hips are generally wider.
Go ahead and practice drawing each figure until you get it pretty close, and feel free to draw your own stick figure/pose. Also, look at the third example below, I drew someone from behind, notice that the stick figure still looks pretty much the same:
