Arrive ten minutes early and introduce yourself as a newcomer. The members will take it from there and can also answer questions you might have. Stick a bit around after the meeting. If some go for a coffee somewhere afterwards and invite you to come along join them if possible.
lol, I believe I had every emotion possible during my first AA meeting. It was a huge meeting and I can't remember much (part due to the fact I couldn't understand most of what was said since they were speaking French :-)) but there was this guy sitting next to me who had this smile on his face and made me feel welcomed.