Well, start by jotting down some basic ideas. Maybe it's a character's adventure or a mystery to solve. After that, figure out the beginning, middle, and end. For the middle part, come up with a few exciting twists and turns. Also, think about how the characters grow and change throughout the story.
First, think of a central idea or theme for your story. Then, decide on the main characters and their goals. Next, plan out the key events and conflicts that will drive the story forward. Finally, consider the resolution and how it ties back to the beginning.