The Docker documentation is pretty terrible, but it's a decent start. Start by looking at docker-compose.yml files for the services you want to run and the write-ups for those.
Something nobody ever told me, that I had to figure out myself, is that docker-compose.yml files can be placed anywhere you want.
Well, to be fair, I actually bought it to use as a desktop and upgraded it accordingly. Then a few months later I decided to build a Ryzen system. Optiplex got moved to server duty.
I bought an Optiplex 7050 SFF for $100 USD at the start of 2023. Upgraded it to an i7-7700, 32GB RAM, 300W PSU from an XE3 model (stock is 180W), and threw in a spare Nvidia K1200 Quadro for shits and giggles. Runs almost my entire suite of self-hosted applications without a hitch.
I would love to run Graphene OS, but their stance on root ("REEEEeEEeeEeEeEeEEEE iTs nOt sEcUrE aNyMoRe wHy WoULd yOu dO tHaT" Jesus fucking christ I'm aware of the risks now stop being a little bitch about it) drives me up the fucking wall.
Mine returns a 404, but on purpose. Everything I want internet-facing is behind a cloudflare tunnel on appropriate subdomains.
Bingo. I will happily go out of my way to modify things, and if the methods provided to hide root/bootloader ststu from any particular app don't work, then that app gets uninstalled.