You will find some links on the right. There are many personal blogs and sites about both parts of the route. These two forums are practical and excellent …
This site also has links to some useful guides. I purchased the excellent Cicerone guide for each part of the route, as well as the highly recommended but strangely titled Miam Miam Dodo guides. The latter guides are in French however easily usable by any non French reader due to their graphical and symbolic style. They can be purchased from the excellent Confraternity of St James Bookshop, or your local St James association.
Being such a long walk, its best to get travel insurance. A great company is World Nomads who specialise in longer trips to more remote places. I like that the company provides scholarships and supports worldwide community projects.
Knowledge of French and Spanish, though not required, will greatly enhance the walk. Why not learn some French or Spanish before hand? I still remember school French but will be trying to get to grips with Spanish on the Camino Frances!