Hi Sherry! Welcome to LWL and come on and visit us on the main thread -- as my buddy Ilene always says: "we luvs newbies!"
(don't worry --she doesn't eat them for breakfast

)
You are going to love strength training, both in how it makes you feel and how it makes you look. And it really helps with the weight loss, too!
About a bench -- I think the step idea is pretty nifty. I take a class at my gym called Powerflex -- weights set to music -- and we use steps for exactly the same purpose. We lie on it to do chest and triceps exercises -- you are off the floor enough to give you the proper range of motion for your arms and shoulders. And, of course, there's lots of fun leg exercises that use a step.
Let us know how it goes, OK?
Meg