I just got my first GPU that can actually run an LLM (Laptop 5090 24 GB) what do I play with first?

I figure I can run 30b or even 72b models on it, but this is my first time running my own local LLM. I want to play with prompt engineering and see the most complex things I can get it to do. Any hot tips? I know it all moves fast and this sub is wired in I have 32GB ram also