You will need
*****
0thb in a thai bank account in your name only, that's if your going to live in Thailand.
You have to go to your embassy to get the clearance procedures to say that you are not married to anyone else they will give you the ok and valid passport
A translator that can speak thai and English
You will be given two copies of the wedding certificate
You will need to get one translated into English for your country
When you go to the Amphur you should bring your witness with you
That's all I can remember now Good luck
Please Google it to ๐