Your meeting time will help determine snack options for your group. Some groups choose to meet in restaurants. Be sure to find one that has tables large enough to spread your books out and that doesn't mind your group staying for discussion after you finish eating. Perhaps a little wine and cheese will enhance your discussion. Another aspect of reading group you'll want to consider in advance is the format your meetings will take.
Some groups find it helpful to hire a professional leader, at least to get started.
Contact your local library or bookstore to find out if there are such people in your area. Professionals can help you pick books that your group will enjoy and will lead your discussion of the book based on questions they prepare. If your group decides not to use a paid leader, you have several options. This person may also get background information on the book or author to share with the group. In some groups, each member brings a couple of her or his own questions about the book.