Don't listen to these people just show up at the airport and they will give you one. Tell the immigration officer that you want to do their job and ask how to apply. Be sure and speak as many different languages as you know words from. That will really impress them.
someone who learns a language will speak it correctly. A native speaker speaks it naturally. So if you want to talk like a textbook than you are fine either way,but if you want to sound native the only way to learn it is from a native speaker.
so when you are on a tourist visa and apply for your O it cancels the tourist visa? I am glad you are sure, lots of people are sure and wrong at the same time.
20kthb is if you come visa exempt. You are supposed to have cash with you so immigration can see you can support yourself. It is one of the things they can ask to see.
For the DTV you are showing you have access to that money and not going to be trying to find a job in Thailand.