The first time I speak in front of many people is when I was in College. It’s a different feeling, and it depends on the people or person in front of you. You have to be confident, face the audience like you are facing a friend, look them in the eye, remember that you know everything, keep your guts, stand with a smile and most importantly you have to know every angle of the topic you have.
Hope that helps.
P.s. chewing gum helps before going to a battle ^^