Sarria is 112 kms from Santiago and only takes 4 days of 28 kms per day.
Pilgrims need to have a credential (a pamphlet that you collect stamps on) to stay in the hostels (albergues, or refugios). There is an office near the Cathedral in Santiago that looks at your credential and issues certificates saying you have completed your walk.
Surf through this forum and you will learn lots about what to bring, money, hostels, walking, blisters and bliss on the Camino.
Your journey has already begun.
Buen Camino,
David, Victoria, Canada.