What should I do at the gym?

I am 5’3’’ and 110. I am not looking to get all bulky. I simply want to shed maybe 5 pounds and get really toned. I want a fitter tummy, butt, and thighs. The gym at my apartment complex has bikes, treadmills, an elliptical, and one of those big weight apparatus things that I have no idea what to do with. I am looking to spend 30–45 minutes in there daily. I do not have much stamina yet. (15 minutes on the elliptical today wore me out!) I just want some guidance in determining the best use of my time, both in my first week to get started, and then later on. Any advice?