please help all RN's

I am currently going to school for an RN...I was wanting to know for local Chattanooga Nurses to help out on a few questions..IF you work in a hospital and you work 4 on and 3 off do you get paid for 48 hours or can you only work 3 on and 4 off and get paid for 36 hours? Also what is the going rate of pay in each unit at area hospitals...and maybe give a little advice or what it is like in each unit...I am so unsure where I want to work..I am interested in so many parts..such as NICU, ER, Labor and Delivery, and home health...thanks