A client and a relay are not the same thing. A relay is essentially a server, it's just that there's no "central server", and it's function is to forward data, so it's called a relay.
Discussion
I follow that. My question is more if I’m the only client connected to my relay will I see anything besides my own posts? Like is there an inter-relay communication that passes the posts between relays?
If you only connect to your relay and no other relay, yes. It will be a ghost town.
How do you run a relay?
I run this relay in a docker container. https://github.com/Cameri/nostr-ts-relay
👀 Whoa, little advanced for me at the moment!! Have no clue😅