How do I describe Santaigo in terms of who he is, what is his job, and where he lives in The Alchemist?

Santiago is a shepherd and a nomad.

Santiago is a shepherd boy.  He loves the travel, and that is the reason he became a
shepherd.  His father told him only the rich could travel.  

His purpose in life was to travel, and, after two years of walking the Andalusian
terrain, he knew all the cities of the region. (ch 1)

However, Santiago...