This is a Google map of the Catholic Parishes on the Camino. this link was posted by another pilgrim on the American Pilgrims on the Camino Facebook page. If you highlight each parish with your mouse and click on it, it gives you a popup of the information about the specific parish including mass times. It is all in Spanish but not too difficult to understand Parroquias de los Caminos Buen Camino!
Getting to and from your starting point on the Camino de Santiago can be an adventure in itself. There are many great tool out there to help.
A great all around travel site for Europe is rome2rio This is a travel planning site that I use to find the best way to get from one point to another in Spain, although it is great for most of Europe.
Ryan Air is a quick and inexpensive way to get from Santiago to Madrid. Iberia also flys from Santiago to Madrid but is a bit more pricy. Others that fly out of Madrid are Vueling and Air lingus.
For Train Travel:
For Bus Travel:
Alsa I used Alsa to travel from Santiago to Lisbon. They travel much of the country.
Avanza Bus I will be using avanza to travel from Salamanca to Madrid Barajas airport in May and then will use them again when I return to complete the Via de la Plata.
For travel from Biarritz to Saint John Pied du Port:
Caroline Aphessetche @ Express Bourricot is fantastic. (+33) (0)6 61 96 04 76
Please leave me a comment with any others that should be added to the list.
Via De la Plata elevation maps
The link below takes you to an elevation map of the Via de la Plata. While there are definitely areas where there are climbs it seems that until you turn towards Santiago on either the Camino Sanabres after Zamora or The Camino Frances after Astorga.