Easy way to make my own Simple Master Server?

I want to make a simple master server that my clients can connect to. Quite a bit of data will be able to go through t$$anonymous$$s connection, so they can chat with eachother or mail eachother whatever. T$$anonymous$$s master will have its own database to store all the data I need.

Small Chat between players. Not big global chats, just private/group chats. Data holding vector3's to be loaded from the database and able to be requested/sent between players from the master.

When players actually get together and enter a game together, they will be put in a cloud sync room like photon or somet$$anonymous$$ng of that sort. But all my saving/loading needs to go through the base connection to the master.

I have found some stuff on making a master server in unity, but not$$anonymous$$ng really aimed at what I'm trying to do, or giving me insight to do what I want to do. Kind of a book, but if anyone knows some framework that will do it or point me at some good stuff for writing my own I'd appreciate it.