You need to build a template for a print file in Word (it's not that difficult to do, just time consuming) and then it's just a matter of popping your MS into the template.
Right now, the only windows option is either using InDesign, Atticus, or Mac in Air or whatever that cloud thing is called with Vellum.
As far as the cover goes, once you have your final page count, I recommend using bookow.com for their cover template (they'll generate a png, idml, and pdf file for you and they'll even add your barcode). For whatever reason, KDPs cover template is always slightly off (I think it's because it doesn't calculate spine width to the leaf, but to every 10 leafs).