Drawing a human being doesn't have to be difficult. With a little practice, it can be as easy as pie. You'll need a sketch pen, pencil and a paper. Draw the outline of a boy and a girl. Then you can draw the eyes, nose, lips and the body structure respectively. Then give the shades on the outline to make it look more graceful.
Now take the sketch pen and fill the inside color of the dress. Whatever is untidy work should be rubbed off and give the sketch a real look. This will help in creating innumerable characters.