I Am 54, W/type 2 Diabetes And Seriously Overweight. I

I am 54, w/type 2 diabetes and seriously overweight. I work in a sedentary job that takes up most of everyday. I need to change my lifestyle and get the weight off, but I honestly don't know where to start to change. When I try to eat better I feel so deprived and think about food all the time. What can I do to bring about the right kind of changes?