Start by thinking about what you got you to the place you are today. Was it overeating, a poor diet or just a lack of exercise? Finding the problem is the first step.
Next start thinking about the changes you want to make. Determine how much weight you want to lose and when you want to lose it by. The best way to lose weight is to lose 1-2 pounds per week. Unless you are very heavy, losing more weight than that (8lbs a month) may be unhealthy. The weight will naturally come off faster at first than it will later on.
Once you have a target to shoot for you need to develop a diet plan. Use a calorie calculator to figure out how many calories you have to eat per day to maintain your weight. 3500 calories equals one pound. To lose one pound per week take your daily caloric needs and subtract 500 calories. By restricting your calories you to that number you will automatically lose 1 pound per week.
The best way to meet your diet goals is to track the number of calories you eat in each meal. You will then know how many calories you can eat that day and still lose weight. Counting calories isn't a fun job but you must do it to lose weight the right way.
Exercise is another important factor in the best way to lose weight. Diet alone isn't enough to lose weight fast. Burning extra calories will help you meet your weight loss goals. You can do cardio as often as once per day for 40-60 minutes. You should start off slow and work your way up to that goal.
Once you have reached your goal of losing weight you need to make a permanent life style change. The best way to lose weight is to drop the fat and keep it off by permanently changing what you eat, how much you eat and how active you are. Proper diet and exercise need to be a part of your regular routine to keep yourself from gaining the weight back after all your hard work.