What's the best way for me to burn belly fat quickly and get a six pack?

Up tp you.: Depends on your current body status (how overweight you may be). Lots of cardio: it is very difficult to see abs in anyone that is more than ~8% body fat. Cardio will lower your overall body fat percentage. Abdominal exercises to strengthen and bulk up your muscles. Don't forget to hit your upper abs(leg raises) and obliques.

Not too fast: Unfortunately it is not possible to create regional fat loss by any method. Best bet is nutritional weight loss diet with aerobic exercise. Also note that loosing too fast puts you at greater chance of regaining wt and covering that 6 pack back up. When you get your body fat down work with a trainer to do crunches and other excercizes for abdominal and low back muscles. Go for it!