You can use a free Avery for MS Word Greeting Card. Click the Template Only (works with PC and Mac) radio button, and then download. Open in Pages v5.5.2, and first save as a Pages document in your Documents folder. Set the font, etc. to what you want in your Quarter-fold card template. Once you have done that, from the File menu, select Save as Template, and give it a name. While you are there, observe what a right-click on the template name presents in a pop-up menu.
When you open Pages without specifying a document, it will default to a Template Chooser. Your Quarter-fold template is parked in the User Templates category.
Pages v5.5.2 is not designed to compete as a true Desktop Publishing/Layout application. If you want to open Publisher documents on the Mac, get a free copy of LibreOffice, which will open them. Since it is not Publisher itself, your mileage will vary on layout accuracy. The LibreOffice PDF documentation is available, and created with LibreOffice. Since this is a superset, MS Office replacement package, there is a forms designer in the Writer application, and the ability to open PDF and edit them also exists. There is also complete Visio support from the first version to the latest.
When you first launch LibreOffice, you must click the open button in the initial dialog, and afterwards, a double-click will open it normally. This will be true for any Mac applications obtained outside the OS X App Store.