neopoint

I need to change the rear brake pads as I am reaching 60K in my car with service light coming on soon.
I never done that before but I am very good following instructions.
I have the following questions:

1-What part do I need beside rear pads and sensor?
2-Do I need to change the rotors and disk or more than likely they are fine? If most of the time is required what part do I need?
3-How do I rest the service light after pads and sensor replaced? Is that through I-drive or I have to do some other sequences?
4-Anyone has a step by work instruction (Or any link)with pictures that I can follow?
5-Any place that I can purchase the original parts directly cheaper than dealer?


Thanks,