Your abs are like other muscles in your body, don't over work them and don't work them everyday. Doing such will not increase the speed of getting cut. A good diet is the first place to start. Throw cardio in there and then some other workouts that require you to use your core and along with some direct ab workouts 2-4 times a week will help.
Don't take too much protein in as it will be stored in the body or released through the body as waste and not put to use. White meats are the best as well as protein shakes. No carbs at night is a good thing to follow as well, but that is debatable to some people. This all varies on the amount of muscle workouts you'll be doing in regards to arms, shoulders, chest, legs, etc. If you aren't doing a lot and don't want to add muscle size, then you don't want to take in as much protein. More cardio will help lean you up quicker and get cut a little faster that a weight training program.
The late Jack LaLane said it best, "If it tastes good, it's probably bad for you." This coming from one of the fittest guys I've ever seen no matter what point of his life he was in. He ate only fish as his solid proteins.
It's not rocket science and different things work for different people. The P90X workouts are amazing and the toughest is the Plyo and AB Ripper X.
Good luck! And remember, it wont come over night!