How to get a job as a TEFL Teacher? (Ho Chi Minh City)

Hello Everyone! I am new in this group. My name is Annalisa but just call me Isa for short. I came from UnitedStates. I moved here in Vietnam just a month ago. I decided to get a job here as an English Teacher. (TEFL) Do you think there are a lot of opportunities out there? I have not taken any TEFL training or course, should i get one? Do you know any schools to recommend? How hard it is to get a job as an English Teacher here in Vietnam? Are there a lot of competitions?

Answers are greatly appreciated. Thank you!