Cost 950bath in fine if u forget to report the falang that stays at ur place . So no worrys if u forget u can solve it when u go to imigration after 90days
All visas is like a ticket to enter that said its not the same as a right to enter thats always up to thai imigration. Once u get the stamp u get a time frame depending on what kind of visa u paid for. But still not a right since u need to folow the rules regarding the individual visas to be able to stay in the country
Start with getting a thai girlfreind thai driving license that will help alot if u marry it will go even further but the thai driving license will help u getting a bank acc