Before starting off, make a route plan considering the total number of kilometers you intend to ride and the different daily stages. If you do your Camino Frances complete, from Roncesvalles or Somport, bare in mind that you will need at least ten days. Take it easy, so you have enough time to visit the sanctuaries and the key places of the route.
As to your physical preparation particularly if you do not cycle regularly, riding so many kilometers a day will require a strict training as follows: in terms of your physical preparation consider seeing a specialized doctor.
Given the prolonged strain you are about to face, a previous medical checkup would probably be a good idea. Make a training plan, starting with just a few kilometers and increasing distances gradually. Complete your physical preparation by doing exercise on a daily basis, in order to obtain a greater flexibility of the muscles, back and neck.
As to the bicycle you should have it serviced before starting off. Properly operating parts and a good gear shifting mechanism are also essential for such a long trip.
Finally, technique is also important. Ask experienced riders to accompany you during your training sessions. They will advise you on the best cycling posture, how and when to shift gears, pedaling pace etc.
As to how to carry your luggage on the bicycle, you’ll probably need small saddlebags that adjust to the back wheel and to the handlebar. Remember that the less weight you carry, the better. Wear appropriate clothing too, which must be tight and colorful. This way you will get less resistance as you advance and you will make it easier for car drivers to spot you. Do not let anything hang off you or the bicycle, since it may get tangled in the moving parts of the bicycle. A personal washing kit, a sleeping bag and a tracksuit or suitable cloth are also important when you get off the bike.
Observing the Circulation Code strictly, always carry mineral water distrusting the water springs you find along the way and carrying some tools to get you off the hook in case of a flat tire or any other minor breakdown, will help you to make your pilgrimage a unique and an unforgettable experience.