There are many ways to plot. At Writers Write, we advise writers to start by using our basic template - The Five Plotting Moments That Matter - before they begin to plot in more detail. This gives your story a shape. (Read our Plotting Posts when you have some time.) We then move onto a chapter-by-chapter guide, with details about scenes and sequels on our Writers Write course.
Many writers use The Hero’s Journey as a way to work through a story. We found these lovely examples at the end of a great post on Writing Prompts by Heather E. Wright. Heather writes, ‘Documented by scholars such as Joseph Campbell, this pattern has been worked into stories across cultures and millennia and is now a Hollywood favourite.’
Why don’t you try and fill in the template for your story idea?