5'9 from 192 pounds to six pack?!

Six-pack abs take a TON of work and come not only from working out, but what you eat too! You can have super toned abs, but they will never be seen if they are hiding behind inches of belly fat.
You'll need to start watching the types of foods you eat. A strict diet of simple carbohydrates and lean proteins in 6 small meals throughout the day is a great place to start. I recommend The "Eat Clean Diet" because it will point you in the right direction. Most libraries have the book with that title by Tosca Reno, that way you don't have to buy it.
You may also want to increase your intake of mono unsaturated fatty acids(found in foods like sunflower seeds, macadamia nuts, avocados, and olive oil) because they help burn stubborn fat and lower cholesterol.
P90x is not for everyone and it is expensive....there is a similar "generic" brand workout called Supreme 90 Day Fitness, that sells for about $25. It has the same principal concept of muscle confusion and if you find out you don't like it, you're not out $150 you would be had you bought P90x!
Best of luck to you!

Follower of the Eat Clean Diet and current user of P90x
www.supreme90day.com

p90x, look up "ab ripper" on youtube or you could just buy the whole system