9 men on a side, plus a goalie. 3 Attackmen, 3 Middies, and 3 Long Stick Defenders.
Each team must keep at least four players, including the goalie, in its defensive half of the field and three in its offensive half. Three players (midfielders) may roam the entire field.
There's a face-off to begin each quarter, and after every goal. If you control the face-offs, you control the game.
After a missed shot, the team closest to the ball when it goes out-of-bounds gets posession. The team on offense always makes sure to have a player behind the goal to "back-up" a missed shot.
There currently isn't a shot clock, but the offense must make an attempt to score, or a stall warning will be called ... in which case the offense must keep the ball within a much smaller zone.
Penalties are either :30 or 1:00 in length, and give the other team a man-up advantage.
Hope this helps:
http://www.laxrules.com/
There will be a lot of LAX on TV this weekend, and I'm sure you'll pick it up.
Watch SU's game on Saturday, then post any questions and I'll try to answer.