I eat 1200 a day XD So hopefully this'll be of some use as we're about the same height and I was nearly 160 when I started~
When I first started losing weight, it was about 2/3 pounds a week, the only excercise i got was walking to and from school- about 2 miles each way, so about 40 mins of quick walking a day~
Now I lose about a pound a week