“My secret to writing is to never create at a keyboard,” says Thomas Steinbeck, the author and son of John Steinbeck.
You have to know something about your book before you begin to write your story. I think this is true whether you like to plot your novel before you write or not. You don’t need to know everything, but you do need to know something.
For those of you participating in NaNoWriMo, this is especially important. You don’t want to spend your first days plotting or doing characterization exercises.