Sounds good! I had no idea what I wanted to do when I was your age (still don't, actually), but deciding early is definitely good.
One thing I will suggest though is that you avoid AEON. If you're doing it after your degree, apply for the JET program instead and go from there. I don't know AEON specifically, but those private English school companies are notoriously dodgy - whereas the JET has excellent pay, and you teach in an actual school, which is definitely better. What you actually do depends on how that school's actual English teacher wants to work with you though, of course. It's also limited to three years, but that's probably for the best, since it's a good opportunity to get your feet wet before deciding to do it as an actual career.
I had checked out JET and was glad that the basic requirements were the same and that it had the added bonus of working in an actual school. The reason I'm leaning towards AEON is because they had all the costs and whatnot laid out to a T. Whether it be at a private conversational English school, or an assistant at a standard school, I'll keep both options open. As for the three year limit, I'd then have to find another job within Japan in order to rack up my 5 consecutive years required to apply for permanent residency and citizenship.
Honor classes and classes that can earn you credit towards college? Look into that and look into the college you want to go to and make sure the credits get transferred. You can get into college while you're still a Junior and take a class or two. The sooner you finish, the sooner your free.
Honors classes, Dual Enrollment, AP classes: I have taken several honors, a few DE, and one AP. They all add weight to my GPA, but only DE and AP add credit for college. I do know people who go to college early, but it's a bit late for that now. The year that I'd need to earn the last 4 credits I need for high school graduation is my senior year, so I'll get out either way.
