Get all the necessary documents together yourself make sure they are in PDF you can join the documents together using I love PDF and submit when you are ready it’s cheaper in Vietnam to do it yourself and it’s a simple process just answer the questions pay the money wait for the approval
I wouldn’t be surprised if and when the DTV is reassessed that they get rid of the must Thai and cooking. Even most medical can be done on 30 day exemption same with dental and cooking is not worthy of a visa IMO
often it wont say place of issue it will say issuing authority this is not what you add. then the only area listed on the bio page will be probably your country name at the top. Thats what mine had so i put my own country and it was accepted