I do video game reviews so it all starts with playing video games. While I play I write down thoughts to see if the game is giving me anything to talk about and if what it is giving me is good. Once I have a good amount of stuff to talk about, I go back and organize my thoughts and create sections, like Story, Presentation, Audio, Gameplay, Levels, Enemies, Final Stage and I organize my thoughts according to what they fall under. When it comes to writing a full script, I'll just take what I have and start writing and as I'm writing I'll leave production notes to remind myself what to do and how I should act when saying lines. The production notes then help me write a storyboard basically. I only use one location.