Storyboarding your animation
The storyboard is the perhaps the most crucial element in making a successful
animation. Using a storyboard as a formal process, even for short, simple
projects will help you flesh out your animation and make it more appealing
to others without investing a lot of time and only later realizing that there
was something you could have done to make it more exciting.
So what is a storyboard? In essience, it's a comic strip. It tells the
story you plan to tell in animation with still pictures and captions which
explain what's going on at a particular point in the timeline.
Storyboards vary in complexity, depending on the media used and the
complexity of the animation itself. For example, if you don't have synched
sound, there's no need to keep track of audio synching information. On
the other hand, if you have 3 layers of animated sprites interacting, you
may need a lot more detail.
Here's a copy of my current computer-animation storyboard sheet.

Click to download PDF
If you like it, feel free to download it and modify it as you need.