Kathy is right. Probably the most helpful thing you can do for yourself while trying to lose weight is to track what you eat as accurately as possible. When you get a feel for exactly what you are eating, you might be surprised to see what you eat unconciously.
I found this nice calculation finder online that I wanted to share it with you.
How many calories should I burn a day to lose weight?
Drinking lots of water each day and staying active in addition to counting your calories is also key. The journal function here in Fitday is nice too if you feel like writing some of your thoughts down. Good luck Elizabeth!