As a color scheme for your presentation, basic black and white will do the job. But when you're in the mood for more color and a vibrant design, go straight to the PowerPoint themes gallery and try out what's there.
The picture contrasts the default theme, applied to the slide on the left, with one of many others that are available, applied to the slide on the right.
Choosing another theme is no harder than flipping a switch.
See also how to put other elements, such as pictures and captions, on your slides. Then learn some alignment tricks to keep everything neatly arranged.