For those of you who are new to the study of inscriptions, or epigraphy, Dr. Prof. Onno van Nijf (University of Groningen) provides a very good online intro with Introduction to Greek and Latin epigraphy: An absolute beginners’ guide. This will help you get your bearings.Van Nijf is also well-known for his study of occupational associations: The Civic World of Professional Associations in the Roman East. Dutch Monographs on Ancient History and Archaeology, vol. 17. Amsterdam: J.C. Gieben, 1997.