The points raised thus far are essentially the tip of the ice berg.
Another point to be very mindful of as you attempt to gain momentum for what appears to be your version of a grass roots effort is the current seasonal year. The players in the age group that you are soliciting to rally behind the effort very likely are all rostered to one of the current clubs/teams. Someone/club that senses a potential loss of players could use that to extend into the "R" zone.
The magical part that you are going to have to figure out is how to make it convenient for all of the parents. Face it, very few soccer decisions are made by 13 year olds. Parents will all sing the same tune about commitment for the players sake, right thing to do, blah blah, but in the end, if it isn't convenient for mom and dad, it doesn't make sense.
