Crunches dont help!
start doing cardio. 30 mins everyday. Dont think the faster you run the better. Its actully better to do it in intervals. walk 1 min run 1 min then walk faster for a minute then go back to runing. This helps you burn more calories and tone up over all.
Alter yor diet. Eat more protiens and fibers. Less fats and carbs. Also, Stop drinking soda and switch to Water Lots n lots of water.
Crunches only strain your neck. It does nothing if not combined with these activities.
I am also trying to tone up. I actually have a personal trainer guiding me.
Good Luuck!