Hey M
I'm sorry that I can't tell you what to expect, as I have never attended one.
However, I think ACOA issues are at the core of all my codependency issues. I attend CODA group, but to go into that dark area of childhood that has left many scars is what I believe I need to do.
There isn't any ACOA meeting for over 100miles from here. I'm not yet ready to start a group of my own at present. Trying to get my house in order, so to speak.
I wish you luck and support you in your step forward,
Huggs,
Hope