You can apply for one year marriage visa..although first you need an none O type visa first..I have also done it..but I used an agency in BKK..if you need any further info just pm me,I will be happy to help..also use a Thai company for my insurance
yes as far as I know you will get a non 0 single entry but not a multi entry marriage visa,that visa you must apply once you get into Thailand then you must show the 3 month bank statement showing 400k or can use some agencies that can do it for you where you do not need any bank statement but that cost is 30.000 up