If you were to move to Australia and work as an English teacher, your English needs to be native-like. Not living in an English speaking country or not using English daily are not excuses for not acquiring native-like English. There are a few grammatical mistakes in your post (e.g. some information).

I also believe that you have not done your research thoroughly. What kind of English are you going to teach? English literature or English as a second language? Are you qualified to teach in primary, middle or high school? This would determine which ANZSCO occupation you are after and the assessment body is different for different types of teachers. What academic qualifications do you hold, do you have a bachelor degree and a post graduate certificate? Have you taken any IETLS exams and do you have at least score 8 for listening and reading and score 7 for writing and speaking?

You need to have your skills assessment before you can submit your expression of interest for skilled independent visa 189. All these information can be found on the assessment body's website.