You stand at the net post (or on top of a chair at the net post) and you watch the lines on the court to overrule any bad calls made by either player. You have the final say on any decisions. Players change sides after every odd game (after the first, third, fifth, etc. game of every set). Scoring goes 15-30-40-game. First to 6 games win by 2, if the set goes to 6-6 a 12point tiebreaker is played (first to seven, win by 2). The first point of each game is served on the deuce side of the court (the right side) and then it alternates for each successive point. If you want to be very professional, check out the guidelines i have below:
* Call the score.
* Ensure that players change ends and that play is continuous.
* Time 25 seconds between points.
* Time 90 second odd game changeovers. Start your stopwatch at end of last point of odd game. When 60 seconds have elapsed, announce "time". The server has 30 seconds to put the ball into play.
* Ensure that a maximum pause of 120 seconds is allowed at the end of each set.
* Ensure that play is resumed promptly after an authorized rest period.
* Watch for foot faults.
* Listen for let serves. Announce "let, first serve" or "let, second serve."
* When game is finished, announce "game", then player's name, and score.
* During the tie-break, announce the leader's score first, opponent's score, then leader's name, i.e. "3-zero, Stuart".
* Remember to appear confident and in control of the match.
* In order to be as accurate as possible on the serve, watch the server strike the ball and track the ball until it lands.
* Always check the receiver just before the server hits the ball to make sure he/she is ready.
* Try to be aware of all that is happening on and around the court.
Hope this helped! Let me know if you have any more questions!