Yellow text on a dark blue background reads well. We suggest you select a good template and stick to it. In the future, you may want to mix and match slides from different presentations so keeping a similar format helps make all your presentations seamless. Do not crowd information into a slide. In general, use 28 or 36 point for titles, and no smaller than 16 point for text.
Bulleted text is reader-friendly.
A good rule of thumb concerning content is to look at your monitor from 10 feet away. If the text on screen is legible from that distance than you're not putting too much information on screen.