Install text-generation-webui (aka "ooba"), use it to download a good model which your CPU or GPU can handle (e.g. TheBloke/MythoMax-L2-Kimiko-v2-13B-GGUF), install sillytavern and configure it to use your ooba, then get some nice character cards from chub.
(or directly use the ooba webinterface to tell the AI to write a hot story)
I can go into further details if you are interested :)
Ooba is good but kind of technical. I’d instead recommend kobold.cpp for less savvy users who just want things to work. Just download the single exe (no install required) and download a model, then load it up and go!
I know what I'm going to be trying out today! Hopefully I can get everything working