A supportive environment with like minded people, who are all at different stages of their addiction. Some used before the meetings others haven't in 30 years. There may be a little praying since many meetings are connected to religion or held in church spaces.
AA/NA can be very helpful for people struggling with addiction. Every meeting has a chairperson. They will ask if anyone is new. And they will offer a desire chip or a white key tag for anyone who wants to try to stay clean and sober for 24 hours. The chair person will introduce a topic and everyone will go around the room and share on the topic. Sometimes they read from a book. If you aren't comfortable sharing you can just say, "My name is _________. I have the desire not to drink or use today. I think I will just listen." Also if they know you are know they might pass around a newcomers packet to gather phone numbers for you. Inside it will have some basic information on the program. I hope this helps.
You can expect not to be alone in what you are dealing with. You can also expect to have the support of others who are going through the same thing you are going through. You don't have to talk but it is highly recommended that once you are comfortable that you really open up!
Expect love and support, people who understand and know where you have been and know how to get out of it. Also expect people to know when someone is full of bull and when they are not. And most people won't be afraid to tell you.
I have a couple of good friends who are still following NA/AA, even after 6 years of sobriety. I must tell you, those are the most incredible people I know. The NA/AA program, if done well and followed longterm can give you the key answers to all your questions. It may give you new purpose to your life and help you reach your goals. Do not ever be ashamed to go to NA/AA meeting. Many people just stay with their problems without taking the step to solve them. Be proud about who you are. Alcoholism/addiction is a disease and has not much to do with you but with your genes. It's up to you to take control and reach out to people who know how to fight it. It may not be easy, but as my AA friend told me: soon you will see all clearer and be happy that you took this step. Take care!
NA/AA meetings are 12 step meetings that are open to the public. Your first meeting will be a little scary. There is no pressure to talk or share your story if you are not comfortable doing so. NA and AA are peer lead meaning a person also in recovery for x amount of time will lead the meetings. Someone will read the 12 steps and 12 traditions. They will great new comers and do introductions, "Hi my name is ___ and I am an addict." There maybe a topic or a speaker meeting. A topic is where a topic is shared and people give input but not feedback to others. A speaker meeting is where one person shares their story. At the end they will give out chips. The white chip is for one day of sobriety. They will offer it once more after all the other chips and leave on the ground if you are too shy to take your chip in front of everyone. There is no pressure to pick up a chip. Meetings are about one hour long.