Here are some papakupu - Māori dictionaries - to get you started.
We have lots more on the shelves too, just click these catalogue keyword searches for papakupu or maori dictionary
Papakupu online
Te Aka DictionaryMāori - English, English - Māori, this is the up to date and online version of Te Aka dictionary by John C. Moorfield.
He Pātaka KupuTe Reo Māori anake, this is the online version of He Pātaka Kupu: Te kai o te rangatira by Te Taura Whiri i te Reo Māori.
Ngata DictionaryMāori - English, English - Māori dictionary explicitly (but not exclusively) based on Ngāti Porou and East Coast dialect and idiom. Complements the use of other dictionaries produced by agencies such as Te Taura Whiri i te Reo Māori.
PaekupuMāori - English, English - Māori, this is Te Papakupu o Te Marautanga o Aotearoa, which is focused on the learning areas within Te Marautanga.
Wakareo ā-ipurangiThis link opens in a new windowCompilation of a number of separate Maori-English and English-Maori dictionary, lexicon, and word-list resources with new resources added incrementally