You should be able to make pretty good money freelancing on some projects . . . better money than working typical teenager jobs . . . as far as freelancing I'd try to connect with someone on here who needs help . . . avoid eLance if you can.
While freelancing just give yourself plenty of time to complete projects with your limited schedule with school, maybe an hour or two a night and more time on the weekends. You don't have to volunteer that you're still in highschool. You should get an EIN number online from the IRS so your don't have to put your SSN on your W-9 forms that you'll need to give employers so they can send 1099 forms. Present work for incremental review and payment . . . don't undersell yourself . . . if you know what you're doing quote them a rate that's reasonable . . .
If you like development I would think about getting a CS degree as that might fit better with your current skill set . . . but college is a great time to explore other areas of interest. But being young you can become a killer rails developer during college and land a high salary right out of school . . . or get a degree in something you like and continue to develop your developer skill set as well so you'd have two options . . .
There is also the option to complete college and start your own business . . . start listening to StartUpsForTheRestOfUs.com.
As far as languages I'd focus on learning Rails (Ruby) and Laravel (PHP) and Angular. But learning any popular languages/frameworks is a plus.
Good luck . . . Youth is King.