You're following your track, the story, your only plan, your map for the audience, and all the other stuff is, like, the fun stuff: the costumes, the locations, the set-dressing and the actors. They can all be variable as you like if you stick - however roughly - to the path.
Duke Chartres used to boast that no man could have less real value for character than himself, yet he would gladly give twenty thousand pounds for a good one, because he could immediately make double that sum by means of it.