Well... Don Juan was an Iaqui indian shaman, who teached Carlos Castaneda, an anthropologist, his knowledge, during castaneda's researches about use of hallucinogenic plants in indian traditions.
The books of Castaneda are VERY good, if you can read any of them, read, cause they are simply awesome. Anyway, if you cant find any of them, there is a site where all the "teachings" were resumed, so you can learn them without reading the books.

Carlos Castaneda's don Juan's Teachings

Note: have some good weed while reading... cause it will help a LOT to understand it... :thumbsup::stoned:
And any questions... jusk ask!