This serves a great need and if I had a kid I would certainly consider using it. However, after browsing for a few minutes I don't see any way to actually preview the content. It looks like there are some helpful videos but I would suggest making at least a few available to preview so prospective customers can evaluate the quality. You might also consider a homepage video that features the same people in the rest of the videos. That would be an opportunity to explain the site and build some trust.

Good luck on your venture!