Particularly if you're doing a longer (around 3 minutes or more) or a live video project, storyboarding can help you:
"Customer journey storyboard" by visualpun.ch is licensed under CC BY-SA 2.0
A storyboard for a film is like an outline for an essay. Jot down the key ideas that you want to convey in your film and put them in sequence. Then think of how you want to depict each idea and note it in the box.
The Berkeley Advanced Media Institute has an excellent guide to help you.