1.Before any script can be formed, the writer must have an idea of a story. If you don’t have an idea yet and need some ways to find some, try looking at comic books, novels, your favorite cartoon shows, fairy tales, movies, anime, and so forth.Here is another idea. Maybe you could animate your favorite joke? Since cartoons should be simplistic, it wouldn’t be a bad idea. Purchase a joke book online or get one at the library so you can add some good gags and jokes into your script. Even in serious cartoons like anime, there is usually an element of humor. Once you have the idea, write it down before it goes away. Make a series of rough notes to flush out the idea. These notes don’t have to be very detailed just yet, just enough to form a story.
2.Develop a storyboard, which is basically a series of rough drawings that comprise a story. Some animators choose to do a storyboard after the script is written, but others find that it helps the animator figure out the pacing and how it should look on screen. The storyboard could even be a series of stick figures or even simple shapes designating people or objects. As long as it works for you, anything goes. Take your time developing a story, because if the animation is crude but the story is well written, it is still a good movie. If however the animation rocks but the story is terrible, than it is a bad movie.