The best way to get abs...love that thread title... is to eat regularly, drink water, vary cardio intensity and session lengths and strength training the entire body 1-3 times a week.
As already mentioned, 3 sets of 20 is enough. Also a good point was made about doing different kinds of ab work. A good ab routine will be part of a full body strength training routine.
Overall, abs are a direct result of how much fat you have on top of the muscles. Your abs are there. So if you can see them with an empty stomach then my guess is that you need to focus on reducing body fat. There are 5 tips that I post regularly on this board. Here they are for you...
1) Eat 5-6 small meals throughout the day. Each meal should be 2-3 hours apart. Each meal should contain one protein and one carb. The first meal should be eaten within an hour after waking.
2) Drink lots of water
3) Rest properly. This means taking at least 24-48 hours between strength training the same muscles, and it also means getting at least 7-8 hours of sleep per night. Lastly, it means taking 1-2 days off from exercising per week.
4) Cardio. This should be done at different intensity levels and different session lengths. Consider doing a low intensity/long session, a high intensity/short session and a few medium intensity/medium length sessions.
5) Strength Training. Strength train each muscle 1-3 times per week. You should lift a proper weight and perform the proper amount of sets/reps for your strength training method. If you need more guidance or exercise ideas you can head over
All of the above things combined will result in fat loss. Good luck!