As above, English teaching is by far the most common job here for good English speakers. I did it for 31 years and now retired here. No regrets at all. I think degrees are required for decent jobs though, and if you want a work permit. Check first before coming here would be my advice.
Yes, it says all non-Thais must complete the form. I have PR so my country of residence is Thailand, but as that might not an option on the form I guess I’ll put my passport issuing country.