Participate and collaborate as members of a social and intellectual network of learners.
Connect learning to community issues.
Use details and language that show authority and knowledge of topic.
Check out Ian Patterson's video "Public Speaking How To." His tips for how to become a better public speaker, prepare for a speech, and get over your fears. The video is targeted at helping high school students understand the importance of good speaking skills.
Skills for showing authority and knowledge of your topic
Use details and language that show authority and knowledge of topic and respond to questions from the audience.
Use quotes, facts, and statistics appropriately.
Increase awareness of your body language. See Hussain Shafei's "The Good, The Bad, The Ugly"