@Nyawmao Hi, I appreciate you messaging here. I don't know if this could help you but I'll just write down what are the things that helped me as I write my own stories.
WRITING PROCESS:
1. If you already have a plot of the story, write it down. This is the most important part in writing a story. The plot of how your story starts and how it would end. Write at least three paragraphs for the plot. (1) The starting point of the story; (2) the climax of your story where the plot twists happens; (3) the resolutions and how you want to end the story.
2. Write down what your leads are like. Their manners, their personalities, their lifestyle, etc. This is to build the character you want in the story.
3. Since you already have the plot and the characters, you may start a detailed plotting. This is where you start to plot each chapter. Meaning you write down what happens every chapter (Chapter 1 to Chapter XX). This will help you track down the story and helps you be consistent.
P.S. This is what I always do when writing a story. This might work on me and not for everyone, but hopefully this will help <3.