There's no big secrets to getting a six pack and anybody telling you that they have some secret shortcut is trying to scam you. There's three simple things you can do to aid you in your goal:
1. Lift weights. Despite what people tell you, lifting weights helps you burn calories.
2. Interval training cardio. Shorts intense bursts of cardio are going to do more for you than running at a moderate pace for an hour or so on a treadmill.
3. MOST IMPORTANTLY! Your diet, six packs are made in the kitchen so replace all the fatty, greasy foods and junk food with healthier foods. Don't forget that healthy can also be delicious.
With perseverance and a bit of effort, you'll be cutting down your body fat and starting to see a noticeable change. Once you have a body fat around 10% (not precise, everybody is different) you should start the ab workouts to really help with ab definition.