Seriously draw anything and everything. The more versatile/skilled you are in a variety of subjects, the better.
Don't just "specialize" in one thing right off the bat - that will limit what you can do/will be able to do.
References will be your best friend, but it also helps to take some classes and understand the basics of anatomy and overall structures, colors, etc. in art.
It takes time. You'll have good days and horrible ones. Just keep practicing.
No one can truly "teach" you to draw. It's all about your own style, hand-eye coordination skills, and perseverance.