When I was 7 I came up with the idea of 'charm socks.' My mom would take me to buy bags of plastic charms we would sew them on frilly white socks and I sold them at school.
It's mainly about working hard and proving to people you're serious about it and stretching yourself and learning. The mistake a lot of actors make particularly young ones is allowing themselves to feel that they're the finished articles the bee's knees and it's not true.