Hello Jasmine,
Please may i try to put this problem into perspective , you are on a pension of $900.00 per month , you would like to move to Thailand(why?) , you can rent a furnished apartment in a guest house for 8/9,000 Baht per month,you cannot afford a car ,taxis are reasonable any-way , western food is reasonable in some areas , thai food is much cheaper and available everywhere(if you can eat it),it gets very hot at some times of the year and very wet at others , clothing etc is cheap(by comparison) , buses are frequent and very cheap to use , you can usually find a person who speaks English to help you or converse with you , health care can be expensive even though it is far less than 'back home', but i found it to be good to excellent , if you have no problems walking , you will be able to navigate the streets .
Your visa is your main problem .Sorry , this is the smallest nut-shell i could find to put it all in . Colin