Which model to try for new stories that emulate author?

I want to create an emulator trained on books and essays written by my favorite authors that will generate new content. Each author will be brought back to life with their own emulator. This is also a way for me to learn how to train models. Which models and method would I use for maximum effectiveness?

I am thinking of just fine-tuning GPT4 but imagine perhaps training another OS model might be better.