Recommending this blog by the United Kingdom cartoonists, The Etherington Brothers, with a large series of cartooning construction tips by Lorenzo Etherington. (Look for the links at the blog for "How To Think When You Draw" for over 200 free visual diagrams.)

These tips are not quite for beginners, but are likely to be helpful at some points in learning more of how to use the visual vocabulary of cartooning.

You may also enjoy looking at Lorenzo's cartoon art. 8)

http://theetheringtonbrothers.blogspot.com/