EAT - eat clean - eliminate sugars and refined foods. No sodas, juices, white starches such as rice, bread. Eat 4-6 SMALL meals a day - totalling approx 1600-1800 calories. Each meal should contain a lean protein source, but probaby no more than 4-5 oz. Chicken, turkey, beef, fish. Green veggies are also great, as well as low GI carbs, such as Sweet potatos, brown rice and oatmeal.
EXERCISE - if you are doing nothing now, start walking. When that is easy - walk faster, or jog. 30 minutes a day minimum. Try resistance training - if you don't know where to start, then join a gym. Many women are more comfortable at a Curves or something like that. Resistance training will help you build muscle, which makes your body more efficient at burning calories. Plus you'll fee so much better after your workouts that they will become almost addictive. A natural high.
SLEEP - this is one that many people just don't get. There is no TV program in the world important enough to rob you of your sleep. Get a minimum of 7 hrs - shoot for 8. Your body NEEDS that time to recover. There are dozens of studies showing that obesity is higher in folks who get less than 6 hrs of sleep on a regular basis.
Good luck - there are a billion places on the internet to get information from. But above are the real basics. Don't waste your money on fad diets or fatburners unless your diet is 100% in check. Google body recomposition and you'll find some more info as well.
Nole1.