I have to say this site is great, since you can add food and it's calories & nutrition values you make yourself to your own foods, or just add the foods you buy from the store looking at the nutrition panel.
As far as weight loss goes, the main thing is to get your metablism up, and consume less calories than your activities. Don't be alarmed at first if the weight your trying to lose doesn't come off too soon. Your body will soon realize once it knows your metablism is faster, and begin to shed the weight. Also, weigh yourself at the same time of the day, your weight flutates during the day, so weighing yourself in the morning one day, then in the afternoon another is deceptive. A good idea is to weigh yourself once a week.
Using the site is easy to use, but you should monitor your nutrition values, since your body needs certain vitamins and things like fiber to properly burn calories.
Me I fell off the wagon and gained back 20 lbs after being religious using the site. Later, after you've lost some weight your body will hit a wall, not lose anything. Me, it took 2 weeks to get past that line. If you're using a gym, they have trainers, classes and nutritionists; use them. Also consult your doctor, gradually work into your exercise routine. Good luck! You'll get there.