OK most of you know about my bout of pancratitis and the removal of my gallbladder. So far so good with all of that. My blood sugar is no longer a worry and everything else has stabilized. Sadly I'm still way heavier than I need to be. I've lost about 40 lbs with diet alone. I've almost eliminated fast food, processed food, pop and other less than healthful food from my diet. I've limited my portion sizes down to more reasonable amounts and I'm eating smaller meals with snacks in between instead of eating all my calories at once. Now that I'm feeling up to it I need to hit the gym. My goals are weight loss and cardiovascular conditioning. I don't care about being ripped or jacked or how much I can bench or any of that I just want to shed weight and keep my cardiovascular system strong.
So suggest away.
Light strength training might do you some good, but really, you want to focus on exercises that improve cardio. And that means elevating your heart rate, and maintaining that for a period of time.
Walking (A great place to start, and probably overall still the healthiest exercise around)
Or perhaps some interesting sport. In the summer I play a lot of basketball and swim at the beach. Anything like this will improve cardio function, and if you keep it up, will burn through calories and fat, helping to shed pounds.
Good luck, bro! Consistency is key. Starting out, easier is better, because you must find something you will stick with. If it's the best workout on the planet, but you hate it, and only do it for two weeks, fuhgetaboutit.