I agree with some of the PP
Hashing out your food issues with a counselor is going to be the key to your success. Once you can use food a fuel, instead of as a coping mechanism, you will become successful longterm.
Also, make sure that you maintain a consistent, healthy diet. The WW program is awesome because it teachs you how to change your lifestyle positively. You can create a healthy relationship with food when you work through programs like this. Because ultimately no matter what, if you do a "fad" diet, your weightloss will likely be a fad also, for long term, maintainable weight loss, you need to make it a lifestyle change.
As far as exercise, start small, even if its 10 minutes to start its more than what you would be doing if you were on the couch. Besides, you didn't put the weight on overnight, so dont expect it to come off overnight either.
Set short-term realistic goals that will help you achieve your overall goal. Good Luck!