Change the slide master for a better arrangement of the text and other objects that you want to put on your slides.
Save a presentation with a theme (slide design) applied, and save it as a template (.potx file).
PowerPoint 2013 - Use a pre-created template to help you create your next presentation. It already has color, effects, and fonts. You're set to go!
PowerPoint - Create a reusable template by saving a PowerPoint file as a PowerPoint template (.potx or .pot).