to give a little help in saving as a PDF
You don't need to buy an expensive PDF conversion program - most applications can PRINT TO PDF - so you can save the documents you create as PDF files. The PDF is easily opened by almost any computer user, making it a handy filetype if you share your work with many people.
How to SAVE AS PDF in Office 2007
Using PRINT in Mac OS to SAVE AS a PDF
This video gives the URL for a website where you can find instructions on how to save various documents as PDF files.