So I did this using another server on my network using IIS to forward the traffic to the Nextcloud container on my media center running NextCloud AIO. I tried every port but only forwarding requests to the container it set up using port 11000 worked, Have you installed the nextcloud mastercontainer yet? That is where I would begin.
Without networking knowledge, this is going to probably be difficult for you. Make sure you understand Docker run commands and remember that host.docker.internal works in Docker Desktop for Windows in place of 127.0.0.1. Make sure your mounted volumes correspond to folders in your Windows folders where you're keeping your data and that you make SURE to mount them with your initial docker run commands.
Oh, and Docker Desktop is trash for initially starting containers. Try using docker run or, if you like being precise, learn to use docker compose.
PS- DO NOT USE IIS FOR YOUR REVERSE PROXY. I am like a crack addict with computer projects and I still don't know why I chose to remove NGINX on a whim but it was stupid. Even with 14 years of Windows Server knowledge I struggled.
You might be stretching the N100 just a little if the PC needs to do anything else, otherwise it should work. I can do three 80ish GB tone mapped 4K transcodes on my little Beelink I'm testing out.