multi player domino game synching

Hello,
I am working on creating a domino game where it will start off being either 1 human and 3 computer player free for all or team. I am trying to figure out what would be the best way to handle doing the turns. I want to be able to make it where you can eventually have say 4 human players on different computers. I am a little familiar with sockets but don't know how I would keep everything synced up. By this I mean I'm not sure how to have the players be forced to wait until it is their turn before they are able to play. I am a little familiar with semaphores and socket programming but only barely and am wondering what some suggested reading materials might be. Thank you for any and all help.