Authoritative server basics Unity 5.2

Hello.

I want to create an authoritative server for a turnbased game. I've been searching the internet and reading unity's API reference, but I'm having a really hard time to find information about the new networking system.

I tried to follow this tutorial (sorry if links aren't allowed) but I can't get it to work with the new networking.

Does anyone have any advice where to start? I'm feeling kind of lost.

I believe my concept idea is solid and simple enough, but I have no idea how to implement it:

The player wants to do an action and sends a request to the server; The server evaluates the player request and decides if it is a valid action or not; The server replies accordingly to the player; The player's client execute animations, movements, etc, to give the player feedback about the server reply.

This is the basics, later I would like the server to be able to have several instances for different matches between players, but that isn't needed for now.

Any help, tip, direction to a tutorial/guide would be greatly appreciated.

Thank you!