Why are you using 30 reps? Thats endurance right?
Train your abs like any other muscle in your body for size.
So for size that would be around 6 - 12 or so reps with weight.
Sets? Well that depends on the reps IMO
I'd say do around 3 sets for each ab exercise.
Also.... There plenty of ab workouts around you just gotta use the search button.
Read this to:
http://forum.bodybuilding.com/showthread.php?t=308125