And finally - is Bangkok a good place to live for now, considering that I don't have a job yet and I just want to apply for a visa so I can later find work there?—— you can’t “find” work here on a DTV you will need remote work / online work from foreign country (not Thai)
Do it your self , you basically have to get all the documents anyway…. There is no “cheat code” to this visa …. Agency’s can’t “pull” strings at immigration since it’s done completely offshore