Hi Felix,
I read a book at the beggining of this year about a pilot who did bush flying the whole of his life.
Granted, it dates back to the 70's but holds very much the same experience, lifestyle, regulations as in place these days.
It is a great book and i reccomend reading it. It gives you the best insight into that type of flying.
The book is Bush Flying: Romance of the North. By Robert S. Grant.
I dont know where you plan on bush flying. typical examples that spring to mind would be Canada primarily, Africa, Outback Australia, S America.
Goodluck on the search.
P.s I'd recommend as mentioned contacting tour operaters, Remote industrial companys i.e miners, Loggers, Wildlife outposts. they can put you in touch with the charter companys they use for transport.
Cheers