In order to MAINTAIN your ideal weight, you must eat your weight X15. So if you get down to your ideal weight of , for example, 120, you would have to eat 120X15=1800 calories per day, assuming you're doing a normal amount of exercise. There are 3500 calories in a pound.
Those are the facts, so I guess it's time to get out the calculator! Normally, when you're trying to lose, you should eat 1000-1200 calories a day. Walking is a great exercise for your whole body. 20-30 minutes of a brisk walk (without stopping) is great every day. I do the treadmill. Swimming is great, walking, jogging, or even the stationary bike. Of course, no fast food, fried food, sugar, or soda pop.
Bless you and Good luck!