Just tap on an icon and see what it does. Hit the bottom center button to get back to the main screen. Within any program just tap on anything that looks like it might be an icon. Almost always there is a cancel or back arrow at the top to get back one step. The top button will put the Touch to sleep, but not turn it OFF unless you hold it down for several seconds until a red slider bar appears on the screen. Slide that arrow to power OFF the Touch.
If you have music playing, you can hit the HOME button and also do almost anything else on the Touch while it plays. To get quickly to a control menu for music tap the HOME button twice.