Hi there @Siripun!
Don here from Shopify.
Thanks for taking the time to reach out to our Shopify Community here.
We do have a range of Setup Experts you can browse over on our Experts Marketplace and there's even one based in Thailand you can check out.
You can browse by location and language there on the left (though there's no specific language filter for Thai yet) to see who you might like to work with from the available range.
Are you looking to take an existing business online or is this a new venture on your part?
All the best!