i fully agree with the others posting that you should start out at the PAL level as well as clinics and camps. There is no place for tournament players this young. The tourney teams do not focus on individual skills and practice and more so on the team approach and that will not do anything for a child that age.
My son didn't start playing lacrosse til he was 10, but was a natural athlete and it just clicked and he is playing tourney ball now. But i came to realize rather quickly, with all the money i am paying that they are only interested in winning and not about the progression of my son or the others. The more we win, the more kids join, the more money in there pockets so they focus on the team approach running plays and all.