I would suggest getting a scale that gives you your
percentage body fat as well as your BMI. If you do get one, it is best to weigh yourself at the same time each day to see changes over time. Interestingly, Cathe wrote about this in a couple of her recent blogs.
http://cathe.com/5-myths-about-fat-loss-dispelled
http://cathe.com/goodbye-bmi-is-there-a-new-way-to-measure-obesity
I have a scale that measures % body fat, water % in the body, bone mass and BMI. It is put out by Weight Watchers and sold at Walmart. It has worked well for the last few years.
http://www.walmart.com/ip/Weight-Watchers-Chrome-and-Glass-Digital-Bath-Scale/10972654
You may wish to combine the measurements the scale gives you with a record of your body measurements - waist, hips, thigh, bicep.
Good luck, Amwalker93! I had the same goals when I did STS and I did find the program helped me to lower my percentage body fat and gain some visible muscle. Of course, what one eats play into the results!
But the body fat scale can help to keep us honest, on track and motivated.