Start with "The Pilgrimage Road to Santiago - The Complete Cultural Handbook" by David Gitlitz and Linda Davidson. A village to village, hamlet to town stroll along the Camino Francés outlining history, art, architecture, stories and legends. It's a hefty book but I did carry it twice all the way toSantiago. Should you have nothing against technology, there is a Kindle option from Amazon. Another more general book is "The Miracles of Saint James" edited by Coffey, Davidson, and Dunn. Another "classical" collection is of course "The Pilgrims Guide to Santiago" by William Melczer. Good reading and Buen Camino.