I tutor a Chinese and German student in English speaking and writing, respectively. Up until know, I have been using TESL/ESL websites for my syllabus and for suggestions. I also live with a bilingual Filipino who has been relaying his informal learning methods to me.
I would like to expand what I am able to teach to a more structured format in order to get more students and see faster results. What is available for the semi-professional in terms of classes or certifcation inside a modest budget?
Really if the answer is a book
that is fine, but I would also welcome some sort of certification to build credibility.