Cardio, eat right, cardio, eat right, cardio, eat right......................... Running is best, but even a bike would be a good start depending on where you are at right now. Do a google search on some good foods for weight loss, and set up a 5 (or so) meals a day plan, eat every couple hours. I wouldn't even worry about crunches/situps at this point.

I've been lazy a couple times in my life now, but i've done a great job of getting back in shape (from 5'9" 230 to 160 right now), I run a few miles a day 4 days a week and regularly do pull ups and dips throughout the week. You can do it too, once you get into a routine, it's very simple and becomes a lifestyle. If I were down in the Springs, i'd be more than happy to help you out as far as training is concerned.