I lost 50 lbs this past year, PP weight after being on hospital bedrest with baby #4, by just tracking my calories and exercising. I used Fitday to track my calories, weighed my food and ate what I wanted as long as it fit into my calories and macros (protein, fat & carbs). I used bodyweight * 12 for my calories, eating about .8 grams per bodyweight protein, .4 grams bodyweight fat, and the rest carbs.
Example:
140 lb woman would need 1680 calories
Protein .8 grams * 140 = 112 grams * 4 (4 calories per gram) = 448 calories of protein
Fat .4 grams * 140 = 56 grams * 9 (9 calories per gram) = 504 calories of fat
1680-448-504=728
Carbs calories 728/4 (4 calories per gram) = 182 grams of carbs
Of course you can tweak things if needed, but this pretty much how I eat. Fats are healthy fats like nuts and olive oil, they are good for you and will help you feel full longer.
As far as exercise, find something you enjoy

. I started taking spinning, fell in love with it and now I'm certified to teach (don't teach right now because we're moving in 2 weeks). I don't do well with long stretches on cardio machines because I get bored, so if I want to do additonal cardio besides walking/running or spinning I'll do intervals of 20 minutes. I also enjoy lifting weights and do that 3 times a week (I'm also a PT but again not training because of our upcoming move).
Good luck!