Getting a bike drivers license

Yo guys, I would like to do a driver license test to be able to ride a bike around Thailand (and Vietnam). For context I have no license and never drove before.

Checked online and booked a slot with the DLTsmart queue app, and got an appointment. However - it says I need to provide my old drivers license to get a Thai one, which I obviously don’t have. 

Any advice? Should i just show up and ask them to do the tests? According to what I fouls online you can do the exam and get the liscense in 1-2 days . 

Cheers