You need get non O visa from uk ( Thai embassy ) quite easy. Then when you get to Thai you can open bank account with that. Then apply for 12 month extension ( and again each 12 months ). I had to get a letter from immigration as well ( quite easy take 4 photos with you ). When you here if you want easy way to get 12 not n extension try thaivisacentre.com on bk they are brilliant.