Udon Thani Thailand Forum - Udon Thani, Thailand

I need to tax & insure 15 yr old Honda ( due date20th Feb)and know I need to go to the ครบ? “garage” but can anyone advise what else I need to do& where and some idea of likely costs of each step in the process
I have the green book but would I need to take my passport or will my Thai driving license be sufficient?
How far in advance or how many days grace after due date are permitted
Thanks in advance