Wouldnt go into stocks w/o a ton of research.
But if youre really interested....
www.tastytrade.com does a decent job of talking about stocks. They focus on options. I personally dont see myself ever fukking w/ stocks like that. Unless you have time to pour over a companies reports, its a losing battle IMO.
IMO the quickest and best way would be to start your own business.
It doesnt have to be brick and mortar (very old school and expensive). Could be eCommerce, a stand in the mall, affiliate work...basically anything you can scale.
or...real estate.
Most money is made in real estate. I personally think multi unit apartment buildings are the way (once I get enough capital im going to try my hand at it).
I forgot the name of the program...but first time home buyers can buy a building and only put down like 3%-4% as long as you live in the building for 12 months (its also much easier to get a loan for investment property as opposed to a personal buy). Could live rent free (your tenets would pay your mortgage), and then build on that as time goes on.
A new career? If I could start over, I would go into sales after highschool. Would learn how to be a great salesman...if you can sell, youll never go hungry.