Depending on where you are and what facilities there are in your area it may be possible for someone to come and see you to tell you more about alcoholism, or perhaps when you attend your first meeting, you may be given a ‘Starter Pack’ to help understand more about alcoholism and the fellowship of AA.
Most of the pamphlets that are in the starter pack have been made available online too. You can download them from the links below and read them at you leisure.
If you still unsure, check out the “12 Questions” page.