how big do i have to be before you perform plastic surgery on a person and whats the cost.

my name is delores and i weight about 215lb now i am 5ft 8in. and is very insecure about myself now. i use to be very atheletic and now i feel very lazy. I just had a birthday in which i am 44yrs of age. i would love to loose some weight in the abdomen area but i have no energy. how can you help me with this problem.