Start off slow. Just walking will help out. If you try to jump into something hard, and hurt yourself, or get demoralized then you will just end up failing.
First, I recommend learning how to cook. That way you change your eating habits at home, and take ownership of what you prepare. Doesn't have to be complex stuff, but basics are good enough to help out. As for diet, I recommend dumping all processed foods.
Drinks, I would allow water, tea (minimally sweetened if need be), coffee (minimally), alcohol (minimally, red win mostly due to its help with heart issues). The more calories you stop drinking the better.
Carbs, I would test if you are a good candidate for low carb diets. Some people are not, some people are. I would try to minimize the amount of flour based products you eat. I would stick to potatoes, sweet potatoes, things like that. Also I would cut out as much sugar as you can.
Protein, eat more of it. Lean protein is good, especially fatty fish.
Fat, don't be afraid of it. Moderation is key though.
Basically eat fresher stuff. I always think of it as, if I had to buy nothing that came from a box, jar or bottle, what do I want to eat. Then I go from there.
As for calories per day, I would take your body weight and multiply it by 15, that is your maintenance, no weight loss, calories.
220 x 15 = 3300 calories. Now to loose weight I would take about 20% off. So I would go with around 2600 per day.
I recommend this website, its free, and you can pretty much find anything there and get its nutritional value.
As for break up of food, I would go at least 0.75 grams of protein per day per lb of weight. This way you stave off muscle loss and also fill your diet with more sustaining food sources. Basically protein keeps you fuller longer.