difficult to know what they will ask so you just have to be quick witted. My case i had a retirement visa for many years extended every year. Had an indefinite emergency so left little before my visa expired. Never extended it. Returned without an onward ticket. Was asked why i never renewed. Indefinte emergency. Why returned now? I want to renew my nonB n retirement visa. Ok n let through.
TEFL can be got cheap in many places BUT check carefully how well and from where it is accredited. Check the accreditation website to see if their's is noteworthy. Also take note that the 120 hours course is the minimum requirement. But if you have the Level 5,
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hours course, it will give you a better edge. This course is on par with CELTA. I run a UK franchise so I am advising. A TESOL DIPLOMA
Paythe agent 16k Thai baht n you are good to go or 1 year.if yu want multiple entry pay 4k more. Or pay in advance at immigration 1k fo a re-ntry permit as n when needed. I did mine for yeaes hen lwft Thail.and. if in Thailand, you need to do a NonB, 18k for 90 days. Then they will do your 12 month retiree visa for 16k. They will show the 800,000 baht for you but you need an SCB bnk ccount. Aother bank account means extra charges.you dont even need to go to the immigration. Or apply in your home country for NonA visa n agent will do your retiree vsa while you are in Thailand.
Everyone should bear in mind one important factor about Thailand which is absolutely true. There are rules, but these rules are interpreted differently from city to city and people to people. So even at the same place another will give a different interpretation. Unless you have something concrete in writing I suggest just avoid any kind of working without a legit work permit. You don't want to spoil a good future in the land you have chosen to retire/live, especially with a loved one. One simple example. I went to KTB bank on Charoen Nakhon to open a bank account. they said I cannot to so without having a work permit though I was on a retiree visa. I went to Rama 3 mall and after enquiring at a few banks went into KTB. They said just give us your passport copy and choose the account plan you want and they opened it within a few mins. Immigration works the same way. Why is one person asked for a return ticket while others aren't. It all depends on who is at the airport counter. Many such examples. Bottom line if you have nothing in writing, don't risk it. Channel your energy in other things. I did online teaching, started a YouTube channel just to enjoy making and uploading videos
Gardening as a hobby etc is ok. But work in fields (produce will be sold) , or helping in anything that sells for money is a NO NO. if you are gardening veg n wife sells means helping a biz w/o a work permit. Got it!!!