Before you start I would like to say that there is no definitive guide for drawing, it is something very personal down to the way you hold your pencils and pens.
Step 1: Materials you will need
For now the drawing is kept simple and yes if I get good feedback I will add more instructables as follow ups that as the pictures below show will take you up as far as the level I am at. Unfortunately I will have to become a better artist when that point in time comes along. I would be able to give better examples and plan to add them when my art coursework finally comes back to me from moderation as I was under special circumstances this year due to my fathers passing away.
In the meantime these two images will have to suffice, the first being a caricature of Angus Young, or was it Bon I did too many caricature in one night and the second is from my coursework that shows a good example of shaped cross-hatching on the lighter's body (best ignore the rest I was firing out a page a minute for a deadline)