I'm just gonna throw in my two cents. When I decided to start getting serious about fitness/being healthy literally the best piece of advice I got was "make healthy food, in BIG batches. That way you're sort of forced to eat the good food, as it's the most convenient thing at hand." I started out taking a couple hours and cooking 1 or 2 cups of Quinoa or Lentils (I was looking for carbs with the highest fiber content and always had plenty of canned beans/chickpeas on hand for if I ran out) and a huge saucepan full of sauteed veggies (onions, carrots, peppers, spinach, bok choy, celery, mushrooms, whatever I felt like as long as it was lots of them) with some kind of sauce, usually basic tomato sauce with spices or a balsamic reduction. I'd keep that in the fridge or half in the freezer depending on how big the batch was and I could usually eat that for up to a week before having to cook again. That was how I got into the swing of eating healthy. Now it's basically second nature, only I've found that nowadays freezing individual portions especially of protein (ground turkey, whatever) and taking them out daily is a good way to remind myself to stay on track.
Also, if you go out and buy fresh veggies wash and cut them up as soon as you get home. It eliminates any time crunch/convenience excuses you could otherwise come up with for not grabbing a healthy snack instead of a bag of chips.
As for getting started with exercise, I'm a firm believer in the Jillian Michaels workout programs. I was and am still clueless and terrified of the gym haha. So the option to work out at home using mostly body weight and some basic hand weights is awesome for me. I started with the 30 day shred, and until I was really committed to working out, done cutting myself slack, letting myself ease into it, I would keep coming back to that. Finally I did her full body revolution, which was awesome but unfortunately a tad expensive. I've done a tonne of her dvds, can't speak for every one but for me they're a good fit.
Anyway! Sorry I'm so long winded! Take it at your own pace, make yourself realistic goals, know what parts of your diet are problematic and cut them out as a first step. Also finding something you're just passionate about is a great way to segue into ball busting physical activity. Things like dance, flexibility training, hula hooping, whatever might float your boat. There I go again! My apologies, hopefully some of this was useful. Get started! You're gonna LOVE it! :)