Plan to get your main message across in the first five minutes or so. Use the rest of the time to present details of argument, evidence, and other material that you deem important or interesting. End with a short, snappy conclusion that drives home your main message. Use visual aids when possible. Don't overcrowd your visuals.
Tiny print is a common problem that's easily avoidable.
Take special care to hone your timing and delivery. It's always clear which teams or individuals have practiced and which have not. You don't want to merely read your notes. Familiarize yourself with them so that you only need to refer to them every now and then. Arrive ahead of time.