Our U8 teams play a modified version of the FIFA Laws of the Game.  The most significant difference is the teams are smaller (6 players on the field) and play on a smaller field (90 feet by 100 feet).  This allows developing players to have a much greater number of "touches" on the ball.  Other changes from standard FIFA rules is the absence of the "offsides" rule and we run substitutions by quarters to ensure enforcement of the 50% playing time rule.