I would suggest you go to a few schools take the free session to see if you like the school their teaching structure and how it will effect you the most
Also ask students at the various schools what they think of the school, visa process and the area (the city you stay in Thailand might not be for you after you stay there or it could be the best place on earth)
You could also make a journey to the bkk airport cargo area and talk to the FedEx representatives there…
obviously call first and setup an appointment so you the FedEx representatives and Thai immigration can all sit down and talk
Importing things to Thailand is super expensive so make sure you bring sufficient funds to clear your items out of the customs frustrated items customs hold area