I freeball. I also ramble. Usually if I do something like a news video I would write a script straight out, but I learned that it's ONE: Its a time waster. I would spend about two to three hours just writing the script.
TWO: It makes you sound like a stammering moron. It's been proven that if you read from a script, much like narrating, you tend to roll over your words and stammer and studder.
Outlines? Greatness. Scripts? Unless you're a great narrator, scripts for something like a news video is going to usually be a bust.
Hope I helped.