For starters,
this link may help you a bit on a job hunt, at least on the legal points. My high school jobs were Boy Scout camp in the summers, then I started at a restaurant when I was 16.
I would try and save as much you can, if you can. It's always more satisfying to buy something with your own money. Just ask the $700 Frostmourne replica I bought in 2010 with busboy tips. And if you can't save the whole amount, at least you know your family is going to be helping you. That's what I still do when upgrading my gaming PC... being an only child / grandchild means you still get flak at 26 when buying everything with your own money and not putting stuff "on your Birthday list".