First off, welcome to the best forum on the net hands down! We are all here to help in anyway we can and remember, there's no such thing as a stupid question!
There are allot of back and shoulder exercises to choose from. You generally want to hit a muscle from every possible angle to fully develop that muscle. Here is a great place to start when deciding what exercises to do and how to learn proper form of those exercises! Just click on the link and then go to the back and shoulder section and click on the exercise that you are interested in. Written instructions as well as an animated demonstration of the exercise is given.
Most back and shoulder exercises that you will find in a gym setting are covered.
Next, you want to put together a set of back and shoulder movements. This is where you need to do a little experimenting to see how your muscles respond to different exercises because we are all a little different in some respect.
Generally, you want to have at least 1 compound movement for each muscle group, that means either dumbbell shoulder presses or military presses for the shoulders and rows for the back. Those should be your core exercises for each muscle group. Then just do some experimenting with other exercises to see what combination will work the best for you! Good luck and if you have any questions just ask away.
If you build it they will come