Sign up with a school, that's the proper way to learn. You'll learn how to read, write and speak, that's how you learn a language. Two hours, 2 or 3 tines a week is good.
But you gotta study, if you don't, you won't learn much.
Remember, you're not good at languages, so you gotta make efforts.
Thai is a tonal language, so not easy to begin with (5 different tones = 5 ways to pronounce each word, weather it actually exists and has a proper meaning or not). If you don't pronounce a word the right way, it will mean something else or nothing at all, if the tone you used does not exist for this particular word.
Learning how to read will help you tremendously with the pronunciation, together with learning about the culture and customs (thought process or how Thais think the way they do and why they use the words they use in each situation).
You can always learn a lot on your own, but going to a school and paying for it, will give you guidance, structure and motivation.
1. As you got out of the country without a re-entry permit, the former ED visa is now OVER and you can't get back on it.
2. There is NO renewal possible from the former visa IN the country, the main reason being that you CANNIOT have 2 ED visa back to back in the country. There MUST be an EXIT (or another type of visa) in between two consecutive ED Visas.
3. As you are already overstaying, you cannot just go to your school and have them do the process again for a new ED visa without you leaving the country. Any potential short term extension to "let you breathe" , would be meant to have you leaving the country not staying there to then jump on something else AT ALL.
Side note: When you're not in an overstay situation and you renew an ED visa, your school always make you apply for it (through them) via another country (usually Malaysia, in Penang), that's an EXIT.
4. Therefore, your ONLY OPTION is to leave the country (asap, to avoid the bad look in regards to your future new ED application) and come back on a visa exemption (or another short term visa), then go back to your school and re-apply for a totally new ED visa through them..
It takes 3 weeks of a procedure to a school to get you an ED visa, so don't waste time once you come back to Thailand.
Being cautious and having a plan is always good, but over thinking stuff and being scared for no legitimate reasons isn't, ever.
51 and 55 is still young. And yes, I said young, cause it is on so many levels.
Thailand is one of the EASIEST country IN THE WORLD to settle down and become an expat of, if not the easiest.
It's got tons of Visas to suit your situation and profile, the safest environment on the planet (I've traveled 144 countries and lived in 7), top notch hospitals, an amazing cost of living, outstanding local food, unlimited goods options, more diversity than you'll imagine (scenery, food, landscapes, activities, attractions, etc...), one of the most desirable laid back mentality and an unmatchable quality of life, just to say the least.
If you can't migrate to Thailand with a quiet piece of mind, you won't be able to do it anywhere else and you're definitely not meant to live abroad AT ALL . It's that simple.
You're the perfect age to migrate with no problems at all in terms of Visas. You have the funds to finance your expatriation and lifestyle here, all the rest in only in your head.
So, just grab yourself a good health insurance (that you can always buy here in Thailand for a better price), if it makes you sleep better at night and make the move, no silly excuses.
Let me say it again:
If you can't make it here, as an expat, you won't make it ANYWHERE.
With this METV, you can get out and come back into the country as many times as you want before its expiration date (even the same exact day) and you will get a 60 days extension EACH TIME, no questions asked (that's why it's called a multy entry visa, in the first place).
Nobody will ask you anything, not even a proof of funds (which you already provided when applying for it or you wouldn't have it).
When you first arrive with a METV, you're in for 60 days.
With this visa, you get the choice to leave the country before your 60 days extension expires or to extend it of 30 more days at the immigration (1.900 Thb), before HAVING to leave the country (totalizing max 90 consecutive days) and come back in for a new extension of 60 days.
You cannot stay more than 60 days in a row without getting a 30 days extension, or 90 days in a row after getting that extension.
If you calculate well and leave the country and come back in BEFORE your very last day of VISA VALIDITY, you will also get a last extension of 60 days, that you will be able to extend of 30 more days (at the immigration for 1.900 Thb) AGAIN, turning your initial 6 months visa into a 9 MONTHS visa TOTAL.
BE CAREFUL though, the clock on its validity starts when they issue you the visa, NOT when you FIRST ENTER the country. So check the dates on it and calculate accordingly.
I've had it two different times and it worked more than smoothly each time.
Thais are extremely honest people, your chances to get your phone back are still there.
First, report the case to the Police.
Second, try to go back to the place you took your taxi from, or contact the company to tell the story. If you go there , tell any taxi driver your story. They all know each other as they all work in specific areas, so they might be able to help.