I recommend just set aside an hour a day. Start with walking. Then, walk a little faster. Then, walk uphill for some of it. Then, mix in running short distances. Then, run a mile mixed in with walking. Then, run a mile and a half. You just keep building up your stamina. It's really simple actually. Best if you can do it in the morning. I have trouble sleeping when doing workouts later in the day at times...because of the energy rush. Better to have that energy working for you the whole day. But, I cannot work out in the mornings. Not sure why you need an app to do it...other than I guess it puts you on a schedule for getting there and gives you goals to get there. But, if you do an hour a day for 5 days a week or so...then you will get there soon enough assuming you're giving an effort. Then, you can start lifting weights. Do a workout and then do your cardio workout. The fat will literally start melting away as you gain stamina...assuming you are not wrecking your diet. Throw in cycling instead of walking/running on some cardio days. Mix it up once you feel your body has adjusted to what you are doing (maybe every month or so). When lifting, focus on quality of rep versus quantity. Slow down your reps. You will do less reps per set because you will get tired faster...but you will end up tearing more muscle fibers and benefiting more from going slow using proper form. At present, I do use an app to track my daily food intake and exercise. There are a few of them on iPhone/iPad but I use Lose It! . It's simple and convenient. I know LiveStrong has one but I prefer Lose It! over it. I feel like a million bucks right now...but I still have weight to lose as I've only been "being good" since the beginning of this year. Just don't try to do anything short term and don't burn yourself out trying to do too much in a short period of time. Make it a point to fit in your exercise daily at least five days a week. I find it's easy to eat right during the work week. Weekends are obviously where you can get in trouble foodwise. If you eat a big meal one day, then skip the next meal. Bring in protein shakes for post-workout recovery. I use Pure Pro Protein pre-mixed in a bottle at 50 grams of protein a pop. To me, the hardest part is starting the routine and getting past the first day or two....and the initial soreness. Once the routine gets going, it becomes a la natural to keep going as you start feeling better and the motivation factor kicks in.
