It's stated in my Code of Conduct, but the majority of the paid DLC cannot be used in YouTube videos because it's paid content and shouldn't be shared for free.
I also don't have an official guide, as the DLC is still a massive work in progress. All I can suggest is making different choices to unlock new paths and always picking the choices with the flame icon :3 For example, some additional scenes depend on whether you stay at Ren's or Angel's home.