There was a shortish story I read in middle school that was about a young boy who wanted to be a wizard.
My memory is spotty, but I remember him training with someone who kept having him look at plants and herbs. If I recall correctly he got fed up and looked at his mentors spell book and cast some very difficult spell that unleashed "a monster" on the world that would dominate his destiny.
His mentor saved him and nursed him back to health, gave him a staff and sent him to some wizard school that he thought the young kid would prefer to learn at.
More stuff happens... But I remember in the end he had to fight a dark version of himself.
Had the definite feel of a Bildungsroman.