First, ask your manager if they have a branded company powerpoint template for you to use - if not, no worries!
Keep the format professional and polished - avoid fun transitions, crazy fonts, clip art, and word art.
Stick to company colors and/or neutrals that work well together.
Make the information easily digestible and as concise as possible! This means the viewer should be able to see plenty of the background on your slides, not just words!
Try adding some simple graph or charts if you think it would be helpful and have the data to do so.
Check out the slide sorter at the end and make sure the order of your slides looks right, and that the information is easily digestible.
When you send your manager a final approved version, make sure to export it as a PDF.
Here are even more tips to check out: http://www.garrreynolds.com/preso-tips/design/