If you want to learn to draw and don't know where to start, get a copy of Drawing on the Right Side of the Brain by Betty Edwards. You will be stunned at how quickly you can improve.
http://www.amazon.com/New-Drawing-Right-Side-Brain/dp/087477...
http://www.amazon.com/New-Drawing-Right-Side-Brain/dp/087477...
A good book to read after you are done with Drawing on the Right Side of the Brain is Nicolaides The Natural Way to Draw. It's a lot of hard work, but it's worth it in the end.