There is an abundance of valuable knowledge and information out there. The trouble is knowing where the good stuff is.
Publish courses made entirely out of other people’s content. Each course will have a read/listen/watch list with links to all the best content on the subject, arranged in the right order so you can go step by step until you finish the course and acquire the knowledge you wanted.
For the tweens and teens, it’s an opportunity to see how working works and show they can do more. For retailers, it’s a chance for publicity and showing potential future workers it can be a good career.
Have the young adults apply for different jobs at the stores. Interview them and pick the ones that fit. Then train them little by little (could be a whole semester’s course), then have a day or a week when they operate the store (with not so visible supervision.)