This is the Camino walked by english and north-european pilgrims who arrived in Spain by boat to the galician coasts.
I would suggest you to go directly to Santiago and then to take a bus to El Ferrol.
The Camino begins just beside the ocean.
Another point to begin this Camino is La Coruña. The best option is, again, by bus from Santiago, or by plane from Madrid.
Buen Camino,
Javier Martin
Madrid, Spain.