Many fans of TV shows and book series love to write their own "fan fiction" stories. It allows them to open their minds and play out the story lines they want to see in their favorite fictional works. In fan fiction, you can let your imagination run wild and be the director you always wanted to be.
Study fan fiction to get ideas. The most popular outlets are magazines and Web sites.
Write as often as you can. Also, read and edit your work. Writing requires practice!
Be creative in your plot ideas, but keep it true to the show's or book's format and chemistry.