As a first power supply, I would scrounge up an old ATX power supply and then get a handful of those switching regulators on eBay for a few bucks. They're
$12 for 10, shipped from the US. That'll get you from 12V all the way down to 1.25V, at about 1A per regulator. That should be plenty for a beginner.
Or, maybe $12 is a bit steep for an 11yo, you can go mow some yards and then head on over to the Radio Shack for an LM317 adjustable regulator, or some 7805 fixed regulators.
You're going to need some breadboards and jumper wire; use Ethernet cable for jumper wire, it's really cheap and lots of people have cables that have stopped working.
I got your PM; you're too far away for me to drive it to you, and shipping is murder on things this heavy. I think mowing some grass or something and earning your stuff would do you better in the long run, anyway.