VISUAL COMMUNICATION IS NOT ART. IT'S FASTER THAN ART
You already know how to speak a visual language. When you were a small person, you recognized faces before you knew names. Then later, you probably started drawing before you wrote letters and words. Now you are able to fluently read faces, facial expressions, icons, logos, maps, and a thousand other types of visual language without thinking too much about it. As I just said, you are already a visual communicator.
However, many adults feel that they have lost touch with their ability to speak a visual language because somewhere along the way they were forced to make a choice between being an "artist" or not being one. Most of us chose the second option.
Visual communication conveys the essence of your message in drawings, sketches, icons, or clip art. If you've ever played the game Pictionary, you know that the drawings don't have to be pretty to get your message across! If you want to learn to work visually, you must set aside your inner art critic - or send her to the Met to critique works by the masters. ;)
When you are starting to work visually, the most important thing you can train yourself to do is find the essential points of a story. Once you have these points, you can determine how you'll visualize them and where you need to add lines and arrows to help your audience follow your thought train. After you have those basics down on paper, you can make the presentation a bit prettier by adding color and flair.