I've been involved with chess clubs since the 1960s and its where I started to learn and play chess at a higher level. It can be intimidating at times, but you should be able to find some friendly faces who will sit down and play or show you. The stronger players usually stay together and are a clique (not always, but most of the time in my experience). You want to find someone not playing a game of chess, perhaps watching, and ask if he/she would like to play a game. Usually, they will want to play. If you can find out who is running the club, some officer or director, approach that person and let them know you are interested in playing chess and may want to join the club or get involved in chess tournaments. You may want to avoid blitz chess with the clocks at first, but later try a few blitz games and see if you like it or not. You may not want to write down your moves at first in the slower games, but sooner or later you will have to do that to go over your games and study them or show someone in the club your game. Some people like to analyze other people's games, and the higher rated players, if not playing, may analyze your game and give you advice. Find out all the club has to offer in the way of tournaments, newsletters, simuls, politics, anything to volunteer for, etc. Get involved with any tournament as soon as you can. This will pair you with the right player sooner or later, and its a good way to tell how strong you are or not. See if they have a chess ladder and ratings of the players. See if there are any bulletin boards with news or just chess pictures. Try to bring you own chess board and set. If you have a chess club, that would help, too. Try to play as many different folks as possible. Don't be intimidated by kids, they may be strong, or older folks, they may be weak. Above all, have fun and let them all know you play chess at www.chess.com and for them to join (tell them Erik sent you).
Attempting to join a great chess club full of great players and a few future GM's, and i'm not that good! Ouch!!!!! I neeeeeed advice.