I don't believe that there is a guidebook that describes all of the caminos. Your best bet is to do the narrowing via the web and then get the guidebook for the specific route that you choose. There are several websites that you can refer to, but since you are here already on the Forum, I would suggest your best option is to use this resource.
After all, you've got people here with good experience of just about all of the routes.
To start, I would think about some of the factors that will determine your choice of route:
- How long to you have to walk?
- Is it important to walk the "whole" route, or are you okay with just a section?
- What time of year are you likely to walk?
- Are you looking for solitude? The company of like minded pilgrims? Do you want a well-travelled route or one that sees few pilgrims?
- How strenuous do you want your pilgrimage to be? Are you up for long days or do you want frequent options to stop for the night?
- Similarly, are you ready for a route with lots of mountains? A few? Or do you want something as flat as possible?
- Do you want an experience similar to the ones you see in the movies/read in books/etc. or are you looking for something very different?
- Do you want to stay within Spain? Do you want to also experience another country like Portugal or France?
And, of course, how important are the above factors relative to each other? Which are the most important that will really determine your choice of route and which don't you care about.
If you can answer these questions, I'm sure that people here can point you to the right route for you.
Buen camino!
