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First thing you need is to buy yourself an executive level presentation template. This is how you'd look better and stand out. Envato is a vast network where all business purchase graphics and audio. I rely on Envato too for my templates. http://audiojungle.net/user/StudioPigeon/portfolio?ref=StudioPigeon
Once you have a wonderful template the next thing you need is solid material. Whatever your presentation is about spend a good deal of time gathering solid information about it. Do brainstorming and find out ideas related to your topic and gather it all into one.
Next thing you need to do is think of yourself as an uninformed individual. How would you like the presentation to be as a listener? What pattern would make the most sense to you? Ask yourself these questions to put int he information on the slides and play it to your family and friends and ask for their reviews.
By then you should have an A class presentation! Haha. Goodluck!