Just go get the book Starting Strength. Even if you want to keep doing this bodypump thing, whatever it is, the pictures in starting strength and the long boring prose (if you can stand to read it) will explain really well how to lift properly and why lifting that way is effective. The other book, Practical Programming, will help you plan after you exhaust your ability to progress on the basic SS program. That is, if you are interested in building strength and not just in pumping up or whatever. If all you want is to pump up, then do stuff that old school recommends.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.