Here’s a link to an E-Book written by two German WWOOFers who travelled, learned and worked around NZ. Great read with beautiful images and free to download!
Unfortunately only available in German at this time.
This is what Michi and Rike have to say: “WWOOF war für uns der bisher beste Lebensabschnitt. Wir wollen das Modell mit dem Buch bekannter machen, Erfahrungswerte teilen und Anregungen geben.”
https://www.rimitierra.de/e-book/