I might join, if you realize that doing this will mostly be finding people who will actually want some kids messing around to design there websites. There might be a few people out there who need design for cheap, but they will probably never find you until you build up popularity.
Maybe you can start by building websites for your church, or organizations you are in. (for free of course) You'll get experience working for actual people, and you might build up some popularity in you're local community. If you're in a small town with few or no other design companies, it may help a lot.