Next Vista for Learning's Creative Storm student video contest. One of the rules of that contest is that videos have to be 90 seconds or less. That's generally a good guideline of classroom video projects too. Even though 90 seconds might not seem like a long time, it can be plenty of time if students plan their videos well. To plan a good video students can create storyboards.
The Australian Centre for the Moving Image has an excellent overview of storyboarding for beginners. The ACMI overview of storyboarding includes suggested activities for learning how to create storyboards. Included in those activities is a storyboard template that beginners can download and duplicate. Watch this video from the ACMI for an explanation of what a storyboard is an how it is used in the video creation process.
If you don't want to use ACMI's storyboard template you can make your own in PowerPoint or in Google Slides. Watch my videos embedded below to learn how to use PowerPoint and Google Slides to make printable storyboards.
How to create a storyboard template in PowerPoint.
How to create a storyboard template in Google Slides.