You will find a number of helpful resources with a Te Reo / Tikanga / Maori cultural focus.
Below are the links in Tikanga Maori.
This link takes you directly to digital books in the Oceania region (Australia and New Zealand).
There are a number of bi-lingual and Te Reo texts for you to enjoy.
A Maori online dictionary where you can put in either the Maori or English word or phrase.