Infographic _ Search your favorite web browser for "infographic templates PowerPoint". A couple of free template sites I found for PowerPoint infographics (as of this writing) are Visual.ly and Infogr.am. My favorite templates resource is PresenterMedia.com which is all_PowerPoint_based. It also has a plethora of clipart, animations, and customizable clipart. There's an annual fee for PresenterMedia but it's well worth it if you do a lot of visualizations and create a lot of presentations. The alternative to using templates to create infographics is to create a PowerPoint "slide" however long you want your infographic to be. Do this by using the "Design" and "Page Setup" selections to set the length and width of the page size. Then use shapes, graphics, and colors to create your infographic.
Idea concept build _ Sketch a concept, insert clip art or pictures, and use SmartArt to create a foundational visual... the base visual that you will build upon. Then add additional graphic components directly over the foundational visual. Alternatively you can create consecutive slides where you build increased complexity from the foundational slide so that you show how an idea concept develops and progresses layer_by_layer.