Good idea Gina, To verify a physical building. There is a lot of fraud on the Internet. Buyer beware.
I have lots of experience teaching English in Colombia (South America). I have lived and taught here for 8 years. That is a long time.
I advise being careful with what salary you can realistically earn. In many countries, there are ads on the Internet promising jobs, and then when you get there it is hard to make ends meet because you cannot earn enough salary to pay all of your rent, food, and other expenses. Sometimes yes, sometimes no.
It took several years here of doing it on my own, and then getting full legal permanent residence, to get a job as a Professor a large university here. It helped a lot that I developed a great reputation among a network of private and corporate clients first, prior to the University accepting me for the job.
Do you have a college degree at a minimum? A Master's Degree is sometimes the minimum necessary to teach at the University level, depending on the country and the the job. In most countries, University Professor jobs pay better than English teaching jobs at language schools. I have never been to Thailand, so I don't know of the current specific situatiion there.
Don't expect to be able to save money, American-style, Canadian-style, or European-style. You will be fortunate to cover your expenses, especially if you cannot yet work at a University. And you have a big expense nut to cover...you said $3000...that is a lot, can you do better on your airfare wow that sounds like you are paying way too much. Years ago I travelled many times to Hong Kong and other countries (not Thailand), and I sure got much better fares than that. Can't you find something for something like $1000 round-trip? Go during low season or shoulder season. Try Korean Airlines...they had great service and low fares years ago. But you may need to go the Korean-town areas of cities such as Los Angeles, San Francisco, Vancouver, Toronto, or New York to get these great prices. If you are white at a standard travel agency or directly at the airlines, you probably won't get this type of price....at least this was the case years ago, and I had tons of trips and experience with this methodology for Asian flights. PM me if you need more details.
As to being MTF, yes, I concur with what the other girls here have said. I haven't been to Thailand, but I read many times that they have a long-standing recognition of what in their cultures translates to English as "lady-boys." Lady boys are basically female/males with breasts but prior to SRS surgery, at least as I understand it. Someone can correct me if I am not quite correct here. This has largely been in the professional sex (prostitution) industry as I understand it, but despite this at least Thai society apparently accepts gender changing -- which is probably a real plus for you!

I am SO happy with my new breasts! At just 8 weeks into HRT. I hope your transition is going great.
Johanna.