Next year - as in 2022. No one can advise, rules may have changed by then. Google and embassy website give you most info you need now. Non-O with no insurance not likely to be possible ongoing. Assume you will need full insurance unless you go Elite Visa route.
2 documents. Basically A lab test result for the PCr test and a Dr certificate that you don't have covid (as per PCR result) and that you are fit to fly.
Emirates wanted both when I flew, but Thai immigration only wanted the PCT test certificate