One example could be a story about a little girl who finds a lost puppy on her way to school. She takes it to the local vet, and they manage to find the owner. It's a simple yet heartwarming story.
First, think of a simple idea or event, like a cat getting stuck in a tree. Then, develop it by adding characters, like the kind neighbor who tries to rescue the cat. Finally, give it an ending, such as the cat being safely rescued.
To license political cartoons, you first need to contact the rightful owner. They'll set the conditions, which could include payment and limits on where and how you can use the cartoons. Also, you may need to provide details about your intended use.