My way to get the TESOL certificate

I'm 31 years old man. I moved to Vietnam and encounter the problem of choosing new way of living. My friends told me that teaching English is a good way to live here, so I listened to them, but I had no idea how to teach children. Also almost every english center or kindergarten ask for TESOL certificate. So I checked internet and found World TESOL Academy, also my friend completed 120h course and got certificate. This course gave overall understanding of how to teach young learners. So I can create my own plan and put there my ideas. Thank you very much!