Some meetings have a "Newcomer's Meeting" which can be really helpful to give you the gist.
Honestly, I had to read "How Al Anon Works" to figure it all out.
It can be really overwhelming. For one thing...you're hurting. For another...everyone else seems to already "get it."
I remember the first time someone tried to hold my hand at the end of the meeting to say the closing prayer all together....I about recoiled like a python!!!
You will pick up the lingo and the vibe of everything in no time!