Setup for TTRPG GM assistant?

Still pretty new to local LLMs, and there's been a lot of development since I dipped my toe in. Suffice to say I'm fairly swamped and looking for guidance to the right model for my use

I want to feed the model sourcebooks, so I can ask it game mechanic questions and it will respond with reasonable accuracy (including page references). I tried this with privateGPT a month or two back, and it kinda worked but it was slow and wonky. It seems like things are a bit cleaner now