I’m a pretty Podman novice guy too but I’m running quadlets since it automatically creates and runs these containers just like the other services would be with systemd. In terms of networking I can usually access to my container via publishing a port and using the PC’s IP where the container is running, and this is the default network that Podman uses initially.
I have a Jellyfin quadlet config, that may help you. I’ve had numerous sufferings to make a working one, but here you go (These 3 files are in ~/.config/containers/systemd/jellyfin):