Ive been interested in reptiles since I was little and watched things like The Crocodile Hunter and other Animal Planet shows. I had been especially interested in leopard geckos. When my mom took me to a store where she got her fish and aquarium things, my friend and I went through the store and figured out the total for an aquarium, heater, crickets, hides, and the actual gecko. I could afford all of it with the money I had saved from birthdays and things like that. Out of pure luck my mom agreed. After that, she started getting interested in them, and both of us wanted to eventually breed. We got a male, and then soon more females. It took a lot of convincing and luck (including a lot of times where she completely turned me down). We ended up quite a few geckos by the time I was 11. When I was 13 my parents let me get my first snake, which was a kenyan sand boa for winning the state level of Reptiles and Amphibians in Science Olympiad. After that I aquired a few corns for other things like good grades or awards. I got into bearded dragons and blue tongue skinks. Last year I got into boas and ball pythons.
It escalated pretty fast. I am still only fourteen, but have a total of around 40 reptiles (including ball pythons, boas, corns, garters, beardies, blue tongues, and russian tortoises). I get enclosures as gifts for the most part. I breed my own rats to save money. I do yardwork and things for neighbors and help out at a local reptile breeder's to afford new reptiles or cages. I will also sell or trade some of my animals. Ive gotten animals from all kinds of places including online, expos, craigslist, local people, and through stores. The more fellow reptile people you become friends with along the way, the better. I get, and give, discounts from/to people I talk to often. Once people in the area know you're "that person with snakes" theres a good chance you'll get some things from people who have to rehome or want to sell their animals. Ive been lucky, if my parents hadnt let me get started with geckos I would have never become the reptile person I am today. For the most part I hate telling people my age. People I talk to will figure Im 20 or 30 because of my experience (of course Im no expert) and how I talk. When I say Im only fourteen it gives the image of some bratty kid who begs his parents for things, but I care for 30+ animals by myself, and my parents wont go near half of them. Hope thats what you're looking for.