Here is a video based on How to make and give a powerful speech :)
https://www.youtube.com/watch?v=oGdO_3jlVas

Here are a few tips you can use to present a better speech!
http://www.forbes.com/pictures/efkk45elkij/practice-beforehand-3/

Tips for Speeches

Here's a page you can visit for tips on writing and delivering speeches:
http://www.speechtips.com
Enjoy!