Each meeting is different, but mostly it's people like us sharing their strength, hope and experience...except they can see you
My first three meetings I couldn't say a word, I just sat there sobbing and those wonderful people understood and kept handing me tissues.
You don't have to say anything, you don't have to do anything, unless you feel comfortable and want to. So it's one of those great "show up and let life happen" experiences, and nothing to worry about.
Good luck and let us know how it goes.
Hugs