Hi will it be better to go Chaiyaphum immigration office as we live at Ban Phet or can we go to khon Kaen immigration office for TM30 and resident letter . Can TM30 be done on line

I wish to renew my marriage visa .. show the 400k ..3 months prior to visa renewal .. what other paperwork do I need to show and when should I apply.. please

I recently renewed my British passport.So, tomorrow I'm heading to the immigration office (Chaiyaphum) to switch an extension from my old passport to my new one. Do you know if I need to make copies of my old passport pages, or if I need to take any other documents with me apart from my 2 passports, my departure card and the letter I received from the VFS office about moving an extension to anew passport. Thanks :)