We open with the serenity prayer, then, do introductions (esp if there's a newcomer) read the 12 steps and 12 traditions, announcements, then on to the meeting. We go around the table and take turns reading- the meeting chair will have some pages selected on the meeting topic- then share if we wish to. There's no pressure to read or share, and you're free to pass, especially the first couple of meetings. Those can be very emotional. The last 5 or 10 minutes there should be some time in the schedule for you to ask any questions about Alanon and then close with the Lord's Prayer. After that expect lots of hugs.
My first meeting wasn't a great fit for me, but my second meeting became my home group, so don't be discouraged if this one doesn't seem quite right for you.
Hugs and welcome. Alanon has been a wonderful resource for me. Hope you have a great first meeting.