What does the sentence tell me, as a writer? Outline! If you start an outline from the beginning of your writing process, it will save a lot a work later. You don't need to plan every chapter or paragraph or scene. You don't even need to know how it ends.
But, here are some things you might want to plan in advance:
- knowing your character's motives and goals
- where you want to go with the story
- what you want the theme to be
- what you want the reader to take away from the story