All right, so last blog post I wrote on whether you should be a pantser or a plotter. What was the verdict? I'm a total panster-I write by the seat of my pants and that works well for me. However, whether you are a plotter or a pantser you should make sure that your work follows a well organized storyline. Otherwise your reader will feel like they are going nowhere fast. Do you know what happens when a reader feels like they aren't getting anywhere? They put your book down and write a bad review.
Now, when you are plotting your story, you don't need to know every detail. That's where writers begin to feel defeated. This is precisely why I myself write by the seat of my pants. If I concerned myself with all the myriad details and felt like I had to fill out the chart below, I would never write. I would defeat myself before I had begun. That isn't to say I don't use the chart, I do. But the chart doesn't show itself in my writing process until I begin revising. By then I have some rough ideas written out that simply need refining, and I can move, remove, and add details, events, dialogue as are warranted by the direction of the storyline.
The most important thing you can do is to simply allow yourself to write. If you get caught up in all the possible details, you might never get your story written.
So write, then revise, revise, edit, revise, and edit again. ;) After all, you want your story in top form.