I lived in CM fir 7 years.
Used International permission to drive until I got my Long Stay.
Then presented my car liscence and was given Thai liscence. No test.
For my Bike/Scooter I had theory test and driving test. I just Google Bike test for Thailand and practiced the test. You needed to score
*****
.
Re Bank Account I had one befire because I purchased a time share.
Bangkok Bank but had no trouble opening another with K Bank.
If yiu want to check with.