So you are learning how to move off Auto and try out some of the settings on your camera that allow you to produce more creative photos.
Well here is an online camera, where you can select all the different options, and try them out and see the results, without taking lots of photos yourself.
Give it a try!
*thanks to member bigbikes, for providing this link*
Also there are a couple of other simulators to try:
http://www.photonhead.com/simcam/ Simcam camera simulator
http://www.tamron.com/lenses/learnin...comparison.php simulator - compare focal lengths (mm)