Use Arduino IDE 1.6.4.
Use the Library Manager to download libraries.
If they are not in the Library Manager, try to download the zip-file. For example a zip-file from a Github repository. Use the Arduini IDE to import the library as a zip-file.
If there is no zip file, download the library and put it in your own "libraries" folder. That is next to your projects.
Almost every library contains examples. When a library is imported/added, use the menu of the Arduino IDE to find the examples with that library. They should show how to use it.
Do you know in which folder your Arduino projects are ? It could be:
Users \ YourName \ Documents \ Arduino , or something like that. There you will also find your "libraries" folder, and in it are all the libraries that you have imported/added.
Which pins to use ? I don't understand. The Bounce2 can use any pin.