Boy am I going to date myself. When I was about 11 years old my parents gave me a Kodak ABC Photo Lab Outfit. It contained a contact printing box, Kodak Brownie safelight, trays, film clips, graduate, thermometer, a packet of Velox paper, and a Tri-Chem pack. The Tri-Chem pack contained foil packets to make 8 ounces of universal developer, stop bath and fixer. I have been hooked ever since.
My camera was a Kodak Brownie Hawkeye which took 620 film. Film was developed by see-sawing it in the three trays. Most film those days was orthochromatic and so this was easy to do using the red cup on the safelight.
Somewhat later I bought a copy of Kodak's book for mixing your own chemicals. I bought a Kodak balance and started mixing my own developers probably D-76 and D-72. A photostore near where I lived sold Kodak chemicals such as Elon, hydroquinone and hypo.
A few years ago I was able to buy two Kodak ABC outfits. One is new in the box and never even opened.