It sounds like you got a pretty good grasp on things. Most people want to dive head first into the water, and it usually results in frustration and eventual failure.
Since you are coming from a predominately sedentary lifestyle I assuming, you will want to transition yourself into a more active lifestyle much more slowly than someone who is trying to shed a small amount of weight. In fact, you may have to "lose a little weight" before you can start exercising to lose fat.
If you stick with good nutrition, you can lose fat without exercising. Exercising is really just a bonus, IMO, for someone who is obese. Sometimes people forget that even doing a couple of bodyweight squats for someone who is 280 lbs can be as taxing as a lighter person doing weighted squats. If you can handle doing light walks on the treadmill, that's great, stick with it and progress at a rate that is comfortable for you.
I would suggest instead of hitting the gym 6 days a week or something to the like, that you try to increase your overall daily activity. You would be surprised how much cooking, cleaning, playing with kids, yard work, and walking a dog can increase your daily calorie burning if you are used to sitting all day. Just some thoughts.
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