I do not know what you mean and am not a businessman, so have no insight there. What I am aware of is that without a work/business visa and employing Thai people, you cannot work here making money off Thai people. You would have to check the exact laws as I have no familiarity and do not work here.
yes that is correct Dianne. And the pay can also be very little, less than what Raquel mentions. I am not sure of the requirements to teach though Sammy may be quite correct, you may need a degree - however, there is a demand for teachers now as there are fewer Farang here who even speak English.
Sheesh - tough approach - my advice is take it one step at a time and you can get there, here. You can definitely teach English if you are willing and able and have some background for it - you get an education visa first and then things tend to work out in Thailand - just be of good heart, that is very important. Housing is easy. Sales very difficult or impossible unless you get business visa which means you need to employ 4 Thai people. Would need to learn Thai I think. Wise to make $ in States and bring it here.