Multiplayer Position Sychronization problem in unity2d

Hi, I want to make 2D Game which is something similar to "Funrun", I have some issues in it,

   *  Platform: - Clarity is not proper & Polygon Coliider is not properly working.

   *  Character collider is not properly working..

   *  Multiplayer: -
               
               -  Synching all players position is not working properly.
               -  Game performance in multiplayer is .
               -  Starts game after all player's are instantiated.
               -  identifying each player-tag/name on head.
               -  How can i add friends using fb.-Not yet Implemented, needs suggestion about its implementation.
               -  How can i Chat with freinds.-Not yet Implemented, needs suggestion about its implementation.

I have used Photon Multiplayer Plugins. Please tell me any reference which will be helpful to me starting from scratch to apply muliplayer in 2D game .

Thanks in advance.