What happens next?

How to write a realistic story
Figure out the genre of the story.
The genre is an important part of your writing process. Here are some genres that you could write :
Action fantasy science-fiction romance adventure erotica comedy drama prequel sequel.
Note that no matter the genre, it is possible to write realistically. Even within fantasy, you can make the actions and world seem as real as the things that happen in the reader's own world every day.