Go to your nearest immigration office with proof of your new address, if you rent you will need a copy of the owner ID and blue book, if you are the owner with your wife or girlfriend take them with you with the blue book and get yourself a yellow book,
My wife and stepson got a 6 month visa for the first time applying, I used an agent called easy visa, the chap called Paul King he was a great help, be upfront with him, let him know what happened in the past and he will help you,
can I suggest getting in touch with a chap called Paul King his company is called easy visa, Paul used to work in the British embassy in BKK and he has been running his company for a long time, it only took us two weeks