Whether one is using Pages '09 or Pages v5, the applications themselves will present the contents of your custom templates to you. Time Machine will capture these template locations during a backup. The templates are not interchangeable between applications.
If you have always used the Finder, and have had no reason to use the Terminal application, then the notion of home directory, and the UNIX filesystem path syntax that I provided earlier would be confusing. The home directory is where you are when you first [auto]login, and the view that you have on launch of a new Finder window. The Desktop, Documents, Library, Movies, Music, etc are all children folders in your home directory.
If you are near a book store, you might consider the David Pogue missing manual series a grounded source of documentation on how to use OS X. With each release of OS X, he introduces a new book covering that respective operating system features and how to use them. These books are also on Amazon. Here is one for Yosemite, and with the advent of OS X 10.11 (El Capitan), you can expect a new book for that release.