Write an outline of the main events in the story. This does not have to be a formal outline; just list the main things that need to happen. Be sure to include a list of main characters, their motives and what they look like.
Use stick figures to plan out the action of each picture. At this stage, the pictures really don't need to look presentable; they just need to be something you will understand and remember when you are ready to make the finished copy. You might also make representational figures and move them around to different blocks of your storyboard planning chart to get an idea of how you want things to look.
Draw some stock poses of your characters. Walking, standing, sitting or other actions that are appropriate to your story work well. Spend some time getting to know each character; whether they slouch, stand up straight, fidget a lot or fall asleep in the middle of things. Draw them doing typical things. Save these drawings. Even if you have to change them a bit when you make the storyboard, they will help diminish the amount of drawing you do.
Draw a background for your story. If everything takes place in one spot, use a piece of carbon paper to transfer the drawing to each frame of your storyboard. Alternatively, draw one very nice background, and draw all of the character actions on a sheet of transparent plastic that can be placed over the background.
Scan or photograph each scene in your storyboard using a flatbed scanner or a digital camera. Insert the pictures into a preprogrammed slide show. Play the slide show, and watch your story come to life.