Hell, I was poor when I was older too! Dug a largish garden pond by hand over a summer while in my 30s as I could not afford someone to dig it for me. I now look at that little pond and forget the passion that went into that lily-choked 8x18 puddle. Our soils are very heavy, and in the summer required a pick-axe to break it up enough to shovel a little bit out. It seemed like a monster hole at the time.
Now that my big pond seems to have sealed itself (what?) I may get someone out here to enlarge the garden pond. It is an eyesore now after several years of neglect, and at 43, I am not willing to do it by hand anymore.
BTW I would have loved to have that as a kid, I spent a lot of time rooting around in a nearby creek catching fish by hand, and chasing trout up the creek with no luck. If I had my own pond, I probably would have went down a different path in life. The rest of my time I rode my bike into bad parts of the city to get electronic parts for my other hobby which turned into my career.
I know very little about trout, so I wont be much help at all. I do know that the only way to really learn your stuff is to try it yourself. Like another person said, start with 5 and go from there. No sense putting a bunch in all at once and loosing them. They do become like pets.
Good luck, and have fun!
