To become healthier, you should eat plenty of fruits and vegetables, and drink plenty of water. Make sure you stay hydrated this is important to flush out your system. I think though by doing some slight exercise each day, and eating properly, staying away from the pop, candy, and other sweets, you can lose some weight. It is not impossible to get rid of extra tummy flub with proper cardio and resistance training, but it is a challenge. Eating a proper amount of fruits and vegetables will keep your body from retaining water, which is part of the weight.
Exercise and resistance training is huge! There all kinds of good exercises for the tummy: crunches, with your knees bent and in the butterfly position to name a few. The butterfly crunches are good to hit the lower abs. Really you need to do more than just stomach exercises. General exercise and lifting all upper and lower body exercises and cardio will help you become healthier and lose weight. It is easy to get discouraged so just stay with it. Write down your goals and make a couple copies, this will help it seem more real and help motivate you more since you can see it rather just have it in your head.