I had chicken at 12 I built me own coop and 15x30 pen 2x4s and turkey wire , Came out real nice, I too was the egg king of the neighbor hood.We had chickens and I told eggs.....50 cents a dozen. Had about 5 or 6 neighbors I sold to. Pretty good money for a 8 year old.
I also made Christmas sprays for the Holidays Made Good Money
15-25 dollars depending on size and ornaments used to decorate them some spray paint and spray on snow and away we go.
They use to call me MR Money Bags LOL