I was recently thinking about this and there's just no way I'd allow my child in the entertainment world, especially not alone.
I'd sign them up in singing and dancing classes if they wanted to, music, whatever they want, but there's no way I'd allow them to become a trainee. Maybe when they were an older teen. I don't even think I'd be a helicopter parent, but look how teenagers are treated in the industry.
Debut only after high school, and I'd basically do everything in my power to let them chase their dreams safely.