can teach English as a Subject or language

I am Electronic Engineer, also a Gold Medalist in my field. All my education from beginning to end was in English medium. I taught electronic courses to Diploma level students in a School for two years, so I do have teaching experience. I have English language certificate from my University. My German language skills are B1. I can teach in a manner, as a subject it would be easier to understand Grammar with few fun excercises. As a language, with a little practice, my students can understand, write and speak good English.