Does this sound like a good career plan?

I've decided to major in International Studies in college this fall. After I get my Bachelor's I want to teach ESL in foreign countries for a while. This is something I always wanted to do and I figured it would be good experience for future jobs where I would like to work for the government. Do you agree? Also, what kinds of jobs can I get working for the government with this degree and are they competitive? Any advice? Thanks!