Really, i started with drawing books, when i was like, 7
Later i realized that it doesn't help any, everyone has a distinct kind of drawing type.
Just practice, a pad of paper and a pencil are a good way to get started and sometimes when you get good just look at something to draw, practice proportions, and shading (sometimes shading's a b****)
if i got something wrong, don't really rely or me, this is my first time giving advice!