There are few step which I think one should consider while writing a story. Some of which are summarized below:
First of all if you want to write a story try to write in one sitting. If the story is long and con not be finished in one sitting try to focus on one project at a time.
Build the theme of your story first and then try to develop the story based on your theme.
Develop character of the story as story is based on the characters stronger the character better the story.
Don’t focus to finalizing the story at first place. Prepare the initial draft or out line and then develop.
After writing the story take a critical look on the story from the point of view of reader.