your visa exempt, no visa required for stays up to 60 days, you will have to fill out online the TDAC, Thailand digital arrival card, Thailand embassy website is where to do it, don't be fooled by sites that charge as it's free, must be done from 3 days before you arrive in Thailand
My husband and mine are A6, we also wrote our Thailand address on the back then laminated them, fits nicely in our passports, always get positive response from IO on how our visa's are presented
Anonymous participant 481 I had a plan in place, came here for a month prior to applying for my visa, went to the clinic I chose an had initial appointment and discussed my plans to get DTV Visa softpower medical care and ii was lucky the Dr worked with me on my application, didn't hesitate to provide extra documents when asked for, et etc
You can get it extended, but lot of hassle involved, easier just to leave Thailand and re-enter and get stamped back in for another 180 days, just find a cheap return flight to a neighbouring country