Here's an article that's a good synopsis on what is a storyboard and how to create them.
The author Jane Stevens shows you how to break the story down into its parts, then helps you think through which part of the story should be a video, which part should be a photo, etc. Then Jane gives an example to illustrate her points.
Storyboarding is an essential tool when moving a business story into digital media and this is a very good primer for doing just that. It's an evergreen article, so keep this one around.