A great way to plan your animation or game is by using the Storyboarding process. Movie animators, like at Pixar, use the storyboarding process to help them sequence their ideas. It is also a good way to present your idea to other people who may build-on your ideas and come up with more ideas to help you make the best animation.
Here is a link to download my Storyboard handout. You don’t have to use this template, you could use blank pages, sticky-notes, digital storyboards etc.