I started the Norte in Irun, and flew in to Biaritz with Ryanair. There was a bus from the airport which then dropped us three stops on the Feve from the centre of town and 5 mins from the alberge. There is a walking route from Biaritz which is apparently very beautiful, but I haven't done it myself. The Ciccerone guide "The Northern Caminos" mentioned by Kanga in the post above is probably the best guide, I walked just using a basic guide and accommodation list which is published by the tourist board and which I found online. The hospitaleros are usually very well informed about the choices ahead for the next days walking and can tell you what your options are, and so are the tourist information offices. I pretty much winged it every day and liked the spontaneity which this allowed. The Norte is very different from the Frances, but is a fantastic walk. Buen Camino!