If you scroll down the download page for PPTX Wizard (http://thejimedwardsmethod.com/pptx-wiz-download/), Jim has an instructional video called "How to Create a Killer PowerPoint in 60 Minutes." In this, he teaches how to create master slides, add slides, modify slides and more plus you get the benefit of being able to see how he does it :)

If you do not own the PPTX Wizard, please visit http://pptxwizard.com to purchase your copy today.