Perspective drawing can be a little daunting at first - it can look a bit technical, bringing back horrible memories of struggling through geometry in maths class. But you really need to know the basics, and if you just keep it simple and don't over-think things, it turns out to be easy and fun. Try out this step-by-step article which shows you how to draw simple one-point perspective and then go on to try two-point perspective. Then learn how to find the center of a rectangle in perspective. (It works in both one and two point perspective drawing). Once you've mastered these, you might like to try drawing a roof in two-point perspective.

More on Perspective:
Drawing a Brick Wall in perspective
Drawing Brick and Stone