Inspiration versus preparation... It's a quandary for some... If you wait and write after preparing notes, an outline, etc., does it take away that creative spontaneity and leave the writing sterile and cold? Or does preparation keep you organized in thought, preventing your writing from taking a haphazard, frenzied path?
I personally find spontaneity great, but if I am working on a longer project such as a novel, then sooner or later -- and it's probably better to be sooner -- I will feel the need to organize my ideas, make that decision on where I'm going. Of course, then I always change a few details here and there along the way. Heck, I even do that with a simple email, come to think of it.
But let me know what you think... What works for you? Bottom line for me is... I'm at the wheel and that's great no matter what road I drive on!