Check out these useful websites to help with your studies:

Government and Law
Customary fishing
Government services
Māori Land Court
Māori Land Legislation database
Te Māngai Pāho
Te Puni Kokiri
Te Taura Whiri i te Reo Māori 

Health
Hauora.com
Māori health
Māori Medical Practitioners Association

History
Historical Māori flags
Official History of 28th Māori Battalion(eBook)

Language
History of the Māori language
Kohanga Reo
Ngata Dictionary

Music
Waiata 

News
Māori Television

Tikanga
Marae protocol

Treaty of Waitangi
Office of Treaty Settlements
Signatories  
Treaty of Waitangi
Waitangi Day: a history
Waitangi Tribunal