You can buy a cheap departing airticket to ensure you are not turned away on arrival..which ya wont be but pays to be safe. I cant remember name of the business that sells them...onward ticket or something like that. Its like 20 bucks.
Yes you'll get 60 days mate plus the option of extending it by another 30 days for an extra 1900 baht at Thai Immigration when you get here. So 90 days total is possible.