You don't have to say anything...They'll ask in the beginning if it's anybody's first meeting...You can raise your hand and introduce yourself....If you don't want to share...Just say I'll pass...I'd like to listen...They'll keep it basic as you probably won't be the only newcomer there...Just listen and learn....I'd recommend showing up 15 minutes early and meeting some people before...They're great people....Doing what you want to do.