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
Tirohia kimihia: A Māori learner dictionary by 
He pataka kupu: te kai o te rangatira by 
The Reed Māori picture dictionary by 
Everyday Words in Maori by 
Te papakupu o te reo matatini: A Māori language dictionary of literacy by 
Te reo pangarau: A Māori language dictionary of mathematics by 
Te reo pūtaiao: A Māori language dictionary of science by 
Te reo o ngā toi: A Māori language dictionary of the arts by 
The Raupō phrasebook of modern Māori by 
Collins Māori phrasebook and dictionary by 
