1. Apply a “theme” to all of your slides
on a Mac: Format → Slide Design… (or use the Formatting Palette*)
on a PC: Format → Apply Design Template…
To change the layout of the slide titles, pictures, etc.

*Go to the View menu and check Formatting Palette. Select View > Slide Sorter then select a slide to assign different themes to different slides.

Format → Slide Layout…
To change the background color, add a background picture
on a Mac: Format → Slide Background…
on a PC: Format→Background…

2. Add titles, text & pictures. Either use ClipArt, which is built into PowerPoint, or use Google Image Search (via your web browser, e.g. Safari) and find the pics you want. When you locate the image, click on it, then click See full-size image. Save the image to your Tech folder (File → Save As...). Go back to PowerPoint and:
Insert→Picture→From File… (locate the image you saved, in your Tech folder for example)
Insert→Picture→Clip Art… (for pictures in PowerPoint’s Clip Art)

3. Set up animations for text & pictures
Slide Show→Custom Animation…

4. Add a new slide by going to Insert→New Slide… Choose the layout you want.

GO BACK TO STEP I: With each new slide, repeat I,II and III.
Go on to step V only after you have made five slides.

5. Add transitions by going to Slide Show→Slide Transition…
(easiest when you use slide sorter view).

6. When you finish with all 5 slides, rehearse your slide show by going to
Slide Show→Rehearse Timings. Click the mouse for each animation and transition, then record the time between clicks to make it run automatically.