Starting a multiplayer car game only by the server?

Hello,
I’ve completed building the network multiplayer car game, but i’ve two issues:

  1. how to start the race so that when the server presses “Start Game” the game should start?
  2. How to decide the winner?
    I coded these for a single player but i’m stuck with how to do this for a networked multiplayer

@falconer LMGTFY - Let Me Google That For You