Law 1 - The Field: Goals are inflatable 8' x 6'
Law 2 - The Ball: Size 3
Law 3 - Number of Players: 5v5, Goalkeepers. GK may not play more than one quarter. Mercy Rule.
Law 7 - Duration of the Match: Four 12 minute quarters. Two minute break between quarters 1&2 and 3&4 and a five minute halftime interval. Referees are to end the first and third quarters shortly after 12 minutes have elapsed and at a natural stoppage in play, be it throw-in, goal kick, etc. The players will be directed to take a two minute break and the play will then resume with the restart that was waiting to happen. If no natural stoppage occurs within a minute or so, the referee should stop the match, allow the break, then resume with a dropped ball where the ball was when the referee stopped the match.
Law 8 - The Start and Restart of Play: A goal may not be scored directly from a kickoff
Law 11 - Offside: No offside
Law 12 - Fouls and Misconducts: No slide tackling permitted. Sanction with IFK. Do not show cards to these kids. No caution or send off shall be issued to players. If a child is being too rambunctious the referee will ask the coach to make a substitution of that player to give the child a chance to calm down before returning to play.
Law 13 - Free Kicks: All free kicks are indirect. Opposing players must be 4 yards away.
Law 14 - The Penalty Kick: No PKs
Law 15 - The Throw-in: Players shall be given a second attempt but referees must tell them what was wrong with the first attempt.
Remember, the FUN of the game is movement of the ball. When everyone has to stop to restart the game, the FUN has left the game for the moment. Try to keep the ball moving and not be too eager to call the ball out of play.
See also
USYSA Guide to Officiating Small-sided Soccer