Diet is #1. This is very basic and there are many approaches to try, but I'll give you a broad plan if you are just looking for something. I'm sure the ladies here will add their own insight.
As a starting point, take the weight you want to be (130) * the (estimated) numbers of calories to maintain that weight (15) = 1950; now, add 400 (as the body excretes unprocessed calories each day), which brings your total to 2350.
2350 calories per day will be the starting point. Try an isocaloric diet, which is a third each of fat/carbs/protein. This will = 783 cal in each segment.
783/9 (9 cal per gram for fat) = 87 grams fat per day
783/4 (4 cal per gram for carbs/protein) = 196 grams carbs and 196 grams of protein each day.
Now, spread your meals at least over 5 meals (preferably 6+ meals) per day (and when I say meal, it means food ingestion, which could be as simple as a glass of milk); this will keep your metabolism ramped up. Eat as much roughage as you want; make sure you are getting good fiber. Eat at least 3 whole food meals each day. Fat sources should be primarily poly/mono sources; avoid tranfatties and partially hyrdogeneated fats. Avoid salting foods. Avoid simple sugars. Avoid alcohol (and if you do drink it, add in 7 (empty) calories per gram for each drink towards your daily calorie total).
Also, drink lots of water. At least 32oz per 50 lb, per day.
Keeping a diet log will be *key* if you want to succeed at this; a good, free one can be found at
www.fitday.com -- there's more, and I may have missed a few things, but this should be a pretty good stab at a basic dieting approach.