Marianne, the Primitivo - also known as the "Original Way' would be a good one to start with. Don't forget to visit the Camara Santa (holy chamber) in the cathedral where a number of important relics are kept including the Sudarium.
Here are a few websites to help you plan your route.
http://www.caminosantiagoastur.com/ Assoc. Astur – Leonesa Del Camino with info on Oviedo, the cathedral, the Sudarium (ancient relic) as well as routes and maps.
http://www.caminosantiago.org/cpperegri ... mitivo.asp Large site with stages, maps, albergues etc.
http://www.gawthorpe40.freeserve.co.uk/ Mostly Camino Norte but with a few pages and info on the Primitivo as well.
http://www.concellodelugo.org/ws/cprimi ... o.asp?id=3 http://www.lugo.es/ws/cprimitivo/Maps etc on the Concello de Lugo website.
http://www.amigosdelcamino.com High Section - Click on "Ways" and then Primitive Way
http://www.caminotineo.com Oviedo-Alto Section - The Asociación de Amigos
del Camino de Santiago del Interior - includes profiles maps for each stage
http://www.galiciadigital.com/pcd/Camin ... :1&lang=en Excellent pages on the stages, refuges, maps etc.