-PRACTICE, PRACTICE, PRACTICE!
-Speak loud, make sure everyone can hear you.
-Don't stand up there like it's a loving Dane Cook show. Don't move rapidly around. Stay in one spot, don't put your hands in your pockets, and don't sway back and forth. Also, keep a good posture.
-Make eye contact with the audience. It's okay to look at your notecards every once and a while to check where you are, but don't do it all the time. Don't look at one person/spot the whole time (For one you'll make them feel like they're being stalked), look around the crowd.
-At the end, take questions.