Congratulations Terry, that sounds like an exciting opportunity.
Just remember, the key to public speaking is to envision that you're naked, standing in front of a fully clothed audience (gee, maybe I have that backwards ... no wonder I never know what to do with my hands when I speak in front of a group
Seriously, though, always remember the 5 B's: Be Brief, Brother, Be Brief. (But have fun with it, nonetheless.) Good luck -- I know you'll do great!