Practice, you need to practice until you're comfortable being completely you when you're freestyling your commentary. Everyone's is going to be different, some people say stuff that's completely random and their supporters love it, others say stuff purely about the game, some if recording with other people have full on conversations and forget they were playing that specific game and others like me, like to commentate what they're doing, but mine is mixed in with random, forgetfullness and what I'm doing lol I've found this is better during stealth games or points where I need pure forucs, since my first instinct when sneaking around places in real life is to go quiet, I actually do that while playing games too, so I've been practicing trying to explain my intentions to viewers since they can't read my mind and I'm reminding myself prior, although it kind of comes naturally when I have to explain what I'm doing and some of my supporters seem to love it which surprised the crap out of me, primarily with TLOUR Left Behind. Only advice I have is to practice, you'll find your own style that suits you.
The only time I'll script something is if I'm doing a preview and there's specific points I need to cover, sometimes I write a full script sometimes just dot points, mainly dot points now days, cause when doing previews or reviews I need to be as profressional about it as I can, otherwise it's an insult to the gaming community & consumers.
