Welcome, Jessica!
Start by reading the stickies..they will help you immensely! I think your weight loss goal sounds very reasonable. I am short like you, so I know how every pound shows!
I am 5'2" and am now maintaining my weight loss at around 120 pounds...it's not easy, but it can be done! Start by doing your homework and check in here frequently. THere are lots of folks who give great advice!
Good luck!!!