The best things you can do to help will be to eat right and do at least 20 minutes of cardio in your target heart rate zone. By doing at least 20 minutes at target you will continue to burn calories well after you finish. You can get a fairly cheap heart rate monitor from Polar or several other manufacturers.
You also have to work your abs, but just doing a bunch of situps or crunches won't work. You should do weighted ab work, and it can be something as simple as a 10lb plate on your chest as you do your situps. FYI - some people claim they have back problems when they do regular situps, but I never had.
I do large reps of plain situps/crunches on some days, and sets of 25 with a 35lb dumbell on my chest on others.
But sure enough, I put on a nice coat of winter insulation and am working that off and eating better.
And of course, before beginnin this or any other exercise program, always consult your physician...