Get your theory sorted.
The majority of people fail on the 5 exams and the Standards exam.
Do a little every day of this. See if you can find the "old" divemaster exams.
Also I hate to say it, but the majority of the teaching in Thailand is done in metric.
You can get imperial exams, but if you teach in Thailand, you will have to look at "converting" and coming over to the dark side!
Getting to Dive Asia is quite simple ... but it depends on where you are flying in to ...
If its Bangkok, then you can either fly or take the bus to Phuket, and then from there, if I remember rightly, you can get a bus from Phuket town, or a minibus from the airport.
You want to get to Kata ...
Send them an email, and they will surely advise the best way.
I am sooooooo jealous.
Have fun