In traditional indoor volleyball, there are six players on the court at a time for each team. Each of these players starts in a specific location which is aptly named by its placement on the court....
You rotate in a clockwise direction one position every time you get the ball to serve. Although, once you get better and have a specified position, rotation gets more complicated so that players play...
The person in position 1 (back right corner) is always the server. After one team wins a point, that team gets to serve. Each time they win a point, they rotate clockwise so the next person can serve.