I will write short horror stories for children and kids

This depends on the type of story you want to write. Picture books are usually for ages 3-8, early chapter books for ages 6-9, middle grade for ages 8-12, and young adult for ages 12-18.

Generally, children's short stories should be between 500-1500 words for picture books, 1000-10,000 words for chapter books, and up to 20,000 words for middle grade.

A good children's short story should have relatable characters, a clear plot, and a message or theme that is appropriate for the target age group.

You can come up with ideas by thinking about your own childhood experiences, observing children around you, reading other children's books, and brainstorming with a writing partner or group.

If you are targeting younger children, illustrations can be helpful in capturing their attention and making the story more engaging. However, if you are targeting older children, illustrations may not be necessary.

Use simple language and avoid using words that may be unfamiliar to the target age group. Read the dialogue out loud to make sure it sounds natural and believable.

Humor can be a great way to engage children and make the story more enjoyable. However, make sure the humor is appropriate for the target age group and does not detract from the overall message or theme.

You can submit your story to publishers or literary agents who specialize in children's books. You can also self-publish your story through online platforms like Amazon Kindle Direct Publishing or Barnes & Noble Press.