Frank, I know that goflagfootball.com has a number of plays on their site. Also, I'm not sure if it's free or not, but have you checked out USA Flag Football's site? I think they have some plays for 5v5, 7v7 and up...
http://usaflagfootball.com

Hi! look at www.e-zsports.org all year round and tournaments for youth.

where in Miami e-zsports.org 4 on 4 yr round or letitfly.org all round USA

www.aausports.org

free flag football plays, tips and advice are found at www.flagfootballplans.com. They have plays for all ages and types of leagues.