oh also search the group for "METV" to understand more about them, there's also requirements like showing multiple flights into thailand otherwise they'll just give you a single entry tourist visa.
there's only one long term visa for digital nomads (that I can recall) and I doubt you'd meet the requirements or even want to try for only 6 months. Just put that you're a tourist on your visa application.
Depends on exactly how long you want to stay. Applying for a single entry tourist visa before you come will give you 60 days + 30 ext. + 1 visa exempt border bounce + 30 day ext. Gives you 5 months.
If you want 6 months or more then apply for a multiple entry tourist visa before coming.
it's not a big deal IF you don't get caught before leaving. It's probably unlikely you'll get caught, but if you're wanting to live here long term, it's probably not worth the small risk of being banned
Get a 60 day Tourist visa before coming via the evisa website. You can extend this by 30 days at immigration in Thailand giving you 90 days total. If you want more time you'll need to leave and re-enter, border run or fly to neighbouring country and back. You can then enter visa exempt and you'll get stamped in for 30 days.
You don't require a return ticket but might need proof of onward travel. You can just buy a ticket to a neighbouring country for around 2000B