I don’t have a direct answer to your question. But I advise caution in putting your creative works online in the way you are planning. Between people plagiarizing it (either word for word or just the broader concepts) and AIs doing similar things, you could find that your work gets stolen.
Self-publishing might at least give you a bit of inherent copyright protection. Then at least you will have an ISBN associated to it, and you can always host your stories somewhere (WordPress, Medium, etc.).
If you want to self-publish your stories a free service like Smash Words would work.
I was looking into something similar recently, and asked around on Lemmy. The general consensus I heard was that a Mini PC weren’t ideal, mostly I think due to the fact that they aren’t designed purely for streaming.
One think someone said piqued my interest, and I might try this. They recommended buying a cheap, Android TV compatible streaming box (like an Onn brand one), and side-loading an open source (and ad-free) launcher onto it.
I found this thread over on the Huffman Shitshow that had some good instructions.