You cannot spot-reduce so don't waste your time and energy trying. Like a previous poster said, yes, there are certain foods that are more friendly and less friendly for the mid-section but you cannot magically tell your body "hey! Take the fat of my belly please!"
Focus on your nutrition and cardio for over all fat burning. Crunches are fine but don't get trapped into thinking you need to do millions of them. All the crunches in the world won't matter - you'll get a six pack but it will be well-insulated if you don't pay attention to clean eating and fat torching cardio.
You're already doing the right thing by going to WW. You'll be adopting healthy eating habits to follow for a lifetime which will most definitely assist in weight loss. Once you start that fitness routine this week, I have a feeling you'll start noticing a difference pretty soon! It may not be visible and you may not feel like you look smaller, but I bet you'll notice it in the waistline of your pants.
Good luck!