You are registered in thailand as married? Kor Ror
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or 22? As you don't have a Thai bank account, I would open one immediately after arrival and deposit THB 400k and keep it there, if you can. Use your wife's family to help if possible as banks can be tricky nowadays.
Make sure money is there for 2 months and you should be able to extend the 3 months Non-O visa to a 12 months marriage Non-O visa.
I wish all the best to your wife.