Planning is important. After all, it's part of the Carpe diem Life philosophy. But, when it comes to storytelling via your writing, art, music, etc., you might find it better to work first and plan afterward.
Again, Brenda Ueland: For when you begin such a huge edifice of words, your heart fails you. It's too hard. It will never get done, it is too complex and frightful. No, write what comes to you now. More will come later. The river will begin to flow through you.
Tell the story first!
You write, sketch, noodle first because every word must come out with freedom. If this is done the project/art will be alive.