I can only say what I have done with my uk passport, you will need to provide two copies both of your passport's in colour every page, go on the immigration website and download the form you need to fill in plus if your embassy gives you the a letter from them,
They may also ask you for your bank book if you have a retirement visa that's what happened to me in Bangkok immigration
Frist thing is ring immigration office orGoogle what you need to get the 30 day extension then get the hotel to book your taxi to immigration office and back to the hotel do the extension then back to the hotel