Well you won't be able to teach legally at a government school or get a work permit for teaching regrdless of what people are posting. A TEFL certificate gets you nothing. I was at teacher for 5 years in Khon Kaen. A marriage, retirement or elite Visa are your options if you can't work. You can look for teacher jobs on Ajarn.com if you want.
If you have a BA you can get a job as a teacher with a Non B Visa. You can get your Visa renewed based on a marriage extension when you stop working. But you can also work on a marriage extension as well. You can get a retirement extension as well but you can’t work.
You require no money in the bank for a Non B and work permit. 400,000 baht for a marriage extension and 800,000 for a retirement extension.