To write a Children's Story book, follow these guidelines:

1. Choose a topic or theme for your story. This could be based on something you are passionate about, or something that you think would be interesting and engaging for children. The story should be age-appropriate for the intended audience.
2. Develop a strong main character for your story. Your main character should be relatable and likable, and should have a clear goal or problem to overcome.
3. Create a supporting cast of characters, including friends, family members, and other individuals who will help or hinder your main character on their journey.
4. Write an engaging and dynamic plot for your story, with the story having a strong message or lesson that can be easily understood. The story should include a clear beginning, middle, and end, as well as a series of events and challenges that your main character must face and overcome.
5. Write your story in a clear and engaging style, using simple language and short sentences that are easy for children to understand. Children are just learning to read, so it's important to use language that is appropriate for their age and level of understanding.
6. It's important to edit and proofread your story carefully to ensure that it is free of errors and reads smoothly. This will help make your story more enjoyable for young readers.
7. Another key element to writing a children's story book is to include colorful and engaging illustrations. Illustrations can help bring the story to life and make it more interesting for young readers. Consider hiring an illustrator to create images for your story, or create your own illustrations to help bring your characters and settings to life.
8. Once your story is complete, consider submitting it to a publisher or self-publishing on Amazon KDP to share it with children and their families.