There is an exemption of customs duties on household goods if you're moving to Thailand. There are a couple of issues that may prevent you from taking advantage of it.
There is a limit of time after you move here that your later shipped goods would be eligible for the exemption.
When my Thai wife and I moved here the company handling the Thai customs paperwork said the goods should be shipped under my wife's name as it was easier.
We had no problem with customs as our goods followed us with only about 3 weeks delay. We had to pay duty on only a few things that were not considered household goods.... a step ladder and a box of basic automotive tools. All our clothes, bedding, furniture, kitchen ware, lamps, computers, TV, stereo, pictures, rugs, etc. were duty free.
You probably should check with a customs brokerage firm for more reliable advice. We used Boonma. I only have a number for them in Chiang Mai, 0924856279.
PS. I remembered emailing them so try this: inbound[at]boonma.com