Could arrive on a visa exempt. Get married and then start the process.
This would take about 4 visits to your local immigration. (This is assuming you will be living in an area which immigration has the authority to covert your visa exempt to a non o)
The documentation required generally will be as follows
2 x copies of:
Passport bio page
Passport stamp page
Departure card
Marriage cert (Rose border)
Kor ror 2 (Marriage doc from your local Amphoe)
Wife’s tabian ban
Wife’s I’d card
Wife’s doc that states her name has been changed (if it’s different to what’s on the ID card)
Picture of you and wife outside the house, inside the house, kitchen, bedroom etc.
map of where the house is.
Either 400k thb in a Thai bank account for 2 months OR 12 months of deposits of no less than
*****
thb in a Thai bank account.
(I’m sure I’ve missed something but that’s off the top of my head)
If you do arrive on a visa exempt and don’t currently have a bank account the process will take about 3 months.
1st visit to immigration will be to extend your stay. This will mean you will have been here 60 days.
By this time your money will have been “seasoned”
You will then go back to apply for the non o.
You will then be put “under consideration”. You will go back again to collect the passport. Then one month later you will apply for the one year extension of stay.
VISIT THE LOCAL IMMIGRATION OFFICE AS SOON AS YOU ARRIVE - OR HAVE THE FIANCÉ GO BEFORE HAND TO GET THE HAND OUT
Alternatively you could apply for the non o in one of the many Thai consulates in a neighboring country.
Each has thier own specific requirements.
If you do go that route then ask a question relevant to that consulate for the finer details.