That's some big goals, you should not be thinking so far ahead, you should slow down and concentrate on one thing at a time, Japan is a whole new society, and its difficult to fit in there, so consider other options as well, but i have no reason to stop you if you have your heart set on it!
Yeah, I suppose it's a bit far off
Going to Japan while in the army (hopefully) could give me a taste of it, making it easier to really decide whether or not I want to live there. Who knows? I may not want to live there. But those are my current plans. I'll definitely be a translator or English teacher somewhere. Perhaps Germany if not Japan.