Eating 1500 calories a day is an excellent way to lose weight! In fact, I just lost 18 pounds doing exactly that. It's slow-going, about a pound to a pound-and-a-half a week, but it's gone for good! I suggest you search out a site that gives you the calorie count on various foods (there are lots of them!). Then, stock up on some of your lo-cal favorites. I like tea, BBQ-flavored rice cakes, sugarless gum, and meringue cookies. Village Hearth makes a really good 40-calorie bread, and Campbell Soup has a lot of good options. Fortunately, most foods are labeled with their calories, so it's not hard to keep tally as you go through your day. I actually broke my day into smaller parts: 500 calories before 1:00, another 500 'tween 1:00 and 7:00, and 500 more 'til bedtime.
It really wasn't too difficult! Good luck to you!