I think you mean "eigo no sensei" ("eiga" is "movie").
Go to college and get a bachelors degree. Without that, you won't qualify for a visa to teach English here. It doesn't matter what your major is.
Very very very very few people actually make a career out of teaching English in Japan. And regardless of what sort of work they do, very very very few actually stay here long enough to call whatever they do a "career" anyway. So make sure that whatever you study in college prepares you for a career at home as well.