It sounds like you really have a clear direction; congrats.
I have only taught English as a Second Language, but it seems that the methodology training that you are getting in your TESOL course will lend itself to virtually any language training. (Others, please correct me if I'm wrong.)
In my opinion, your knowledge of languages, your Communications degree and your TESOL course will put you in a very marketable position in the ESL field. Good luck to you.