Unity networking tutorial?

Here's it explained in 15mins C# and JS code available too!

https://www.youtube.com/watch?v=QfzrpxO89tU

Also here : http://www.youtube.com/user/quill18creates?feature=watch

any help how to make timer works and shows on server:

public Text myText;

 public float mytime;
 float myTimer;

     [ClientRpc]
     public void RpcDoOnClient(float foo)
     {
         
     mytime = foo;
     myText.text = "" + mytime.ToString ();

     
     }
     
 


     [ServerCallback]
     void Update()
     {

     myTimer+=Time.deltaTime;


         



             // this will be invoked on all clients
     RpcDoOnClient(myTimer);
         
     }

This is the best reference I found for an updated solution. This guy practicaly defines an unofficial very detailed workflow on how to work with multiplayer games. If you need anything else there is this list of samples people pulled up some time ago.

Good Luck!