To set timings on the slides to advance after a set time, click on the Automatically after box in the Slide Transition task pane.
Use the Up and Down arrows below Automatically after to set the time that each slide will be on screen.
Slides can also advance on mouse click if that option is selected as well.
Next Tutorial in This Series - Apply Animation Schemes to PowerPoint Presentations
11 Part Tutorial Series for Beginners - Beginner's Guide to PowerPoint