There are many books, guides, youtube videos, blogs, Facebook groups, websites about the Camino routes, especially the Camino Frances. I cannot begin to list them here and a quick internet search will give you a long list.
However, my intention is to slowly build up a list of my own most commonly used resources. I hope they will be helpful to you too.
Camino de Santiago – Practical Preparation and Background (CaminoGuide.net eBooks) Kindle Edition
Pilgrim Tips & Packing List Camino de Santiago: What you need to know beforehand, what you need to take, and what you can leave at home. Kindle Edition
A blog I recommend: Nadine Walks – stories of trekking and travel