Despite what you might think, a writer never gets it right the first time. A good story takes hours (and days and weeks and months and sometimes years) of editing, rewriting, rereading, reorganizing, and polishing.
The first draft requires that you write something… anything…. Just get words on paper (or screen). Once you start free writing—brainstorming—ideas should flow. Don’t worry about getting them in any particular order. Just keep writing until you run out of ideas.
The next steps—repeated as many times as necessary—are where you reorganize your thoughts, build your characters, your settings, your plot, your subplots, the conflict, and create a logical, interesting, exciting, reader experience.
Yep! That’s all there is to it. 😉