Best resource I’ve found is searching GitHub.
My setup closely follows https://github.com/Misterio77/nix-config.
For servarr I just translated someone else’s docker compose setup to nix. There are some ready made nix ones you can look at like https://github.com/rasmus-kirk/nixarr/tree/main/nixarr.
The complex networking I just picked up over time once I knew my way around a little bit.
GitHub is your best resource. lang:nix search terms
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For the networking I found some repos with Nix and Gluetun (OCI containers). I don’t see them in my bookmarks, so it was probably a day project when I set up and didn’t keep the references.
That part is still in docker / podman. So any docker network guide just needs to be translated to nix.