Māori Made Easy Website
This is an excellent website for learning the basics of Te Reo Māori.
There is book written by Scotty Morrison that accompanies the site but you do not need it initially as you can work through the exercises on the website. Ngā manaakitanga, Blessings.
Click http://www.maorilanguage.net/maori-words-and-phrases/ link to open resource.