Here is a sample routine that will hit all of your abdominal muscles beginning with the lower abs and then moving on to the upper abs and obliques.
Hanging Leg Raises
Exercise Ball Crunch
Twisting Crunch
Side bends With Dumbbell
You should try to keep your reps relatively high, aiming for the 15-20 range. If you can easily perform more that 25, you’re probably not squeezing hard enough during each contraction or you should consider adding some resistance such as a dumbbell between your feet during the hanging leg raises or holding a medicine ball while doing your crunches. This routine can be performed one exercise at a time (3 sets each with around 30-45 seconds rest between sets) or (this is the way I like to do it) as one giant compound superset. You’ll perform one set of each exercise back to back with no rest in between. After you’ve completed one set of each of the four exercises, rest for 30-60 seconds (if you need to) and repeat for maximum burnage. 
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