I'm not trying to be a jerk, but have you even looked at the NRA site? What don't you like about their youth program material? Why reinvent the wheel? Just in case you haven't seen what they offer, start here:
http://www.nrahq.org/youth/ There is a lot more than just "the NRA basic stuff" here. There is a lot of good stuff in the Resources and Information section. This is one of their jobs and they do it quite well.
Scott