Flying clubs are found at airports, often with their own office or hangar. Larger clubs often have their own websites for prospects and members. Ask among your pilot friends and you might get a referral to a flying club that offers a wide variety of candidate planes.
You can find out more about flying clubs in your area by visiting general aviation airports around you and asking the airport manager or FBO. Meantime, let's take a look at the most common types of flying clubs.