Of course you're apprehensive, but as far as you can manage it, try not to be.
All my recovery has been in London, and I'm aware that meetings in other areas - rural meetings, for example - can be very different, but FWIW here's my two pennorth.
I'll describe what I found at my first meeting - actually, what I didn't find! I DIDN'T find a single dirty mac or whisky bottle. I found a room of 30 people, varying ages from early 20s upwards (now, some years later, you may even find some teenagers). Everyone was clean (in both the hygiene and drug sense). And everyone was sober.
I was very lucky that it was a very proactive meeting in terms of welcoming newcomers, and I am aware that meetings vary in this respect. Healthy meetings recognise that the newcomer, and the opportunity to help a newcomer, is the lifeblood of everyone's sobriety.
I listened to people describing the agains in their drinking: "I had a blackout again, I was sick again, I slept with someone I didn't know again, I drank again when I said I wouldn't, I humiliated myself by not being able to keep myself from getting drunk at supper with friends again." I listened to those stories, and I was amazed that I was in a room of people who were exactly like me, though I hadn't realised they existed. crucially, I realised they were no longer doing these things.
I listened to people describing things that had happened to them in their drinking that had not yet happened to me: hospitalisation, arrest, children taken away.
I would hope that they'd have a literature stand. My most vivid recollection from my first meeting was taking away the Newcomers Pack. In it, was a leaflet that had one page: IF YOU CAN STAY ON THIS PROGRAMME FOR 24 HOURS, YOU CAN STAY ON THIS PROGRAMME FOR THE REST OF YOUR LIFE. I read that and knew I could do it, and that I was finally liberated. For me I'd come home.
You'll get lots of other posts with messages about AA that are both positive and negative, and I know that there are other routes to sobriety. I haven't tried those: all I can tell you is that I know many, many people with tens of years of sobriety behind them, so AA definitely does work.
Just remember that recovery is based on staying sober for 24 hours, no longer. If you can't stay sober for 24 hours, stay sober for an hour. The point is, don't project into the future. Just stay sober.
I wish you luck at your first meeting, and hope that you can identify with what you find there.