There are so many great resources here! I recommend starting with the nutrition/food tracker because that is the key element in weight loss for most people. Then, once you're comfortable with tracking your food on a daily basis, start exploring more areas of this site. I still find something new here almost every day. By tracking everything since May 2011 and using the other features here to keep myself focused, I lost 90 pounds and have maintained that loss for almost a year now. It takes a little bit of time, but it is sooooo worth it!
p.s. I also think that 1000 calories sounds low. I would go with the numbers that the SP nutrition tracker recommends and only make adjustments if you run into issues or talk with a doctor.