Welcome to 3FC! Surf around and settle in! We have subforums based on age, eating plan, exercise and more! I'm glad you're here!
I think that for a lot of us there is no "diet"....I think we look at permanent changes for food and movement....that doesn't mean that everything has to change overnight. Baby steps are a good way to get going.
Please do check out the 300 lb Club that Heather linked to. Lots of good support and smart people over there. Good luck!