You'll also want to make sure that your eating at least a few carbs and fats so don't cut these completley. Instead, eat some carbohydrate before and after a workout and then try not to eat hardly any at other times. The reason that your body needs carbs when your working out, is because otherwise you'll find that your energy levels will crash which will mean that you won't push hard when your exercising.
Secondly, you'll need to design a cardio training routine which will help you lose stomach fat. Because oftentimes all you need to do to get a perfect six pack, is to get rid of your bodyfat. So start thinking about what cardio activities you like and then begin doing them as much as possible. The trick with cardio is to push yourself to a high intensity because that's what your body will respond to.
The third step, is to start doing abs exercises. Now contrary to popular believe, this is not the most important step for getting a six pack (that's why I've left it to last). In fact, you shouldn't even bother doing this until you've got those last two factors under control. But still, this can be really effective once you've got a lean body as it will tone you up no end.