Signalling server is the central point clients connect to in order to re-direct to your game server. I don't know if you can make one yourself, but there is no need to do that as it merely allows players to join your server.
All things that happen regarding the game itself are on your server, or if you allow people to host their own servers then through them.
I take it you're trying to do something like an MMO?
I am so sorry that I still don't get it.(Maybe I am a Chinese and not very good at English, but I am trying hard to communicate with you.)
1.You said “All things that happen regarding the game itself are on your server”, does it mean that when people connect to the signalling server, their game itself will be a server, no need a real server??
2.And you're right, I just trying to do something like an MMO, which I can monitor players with my server. Can C2 do that?=