27,285 people use New Zealand Sign Language.
Around 400,00 people in New Zealand have hearing impairement but 7,000 are culturally Deaf.
There are 62.5% similarities found in British Sign Language and NZSL. Compare that with 33% of NZSL signs found in American Sign Language.
Source: Numbers are based on NZ Census 2002 and research done by Victoria University of Wellington.
[Source New Zealand Sign Language Teachers Association Facts to start with ….]
Looking further on the NZSLT site I see they have DVDs and workbooks available for learning NZ Sign.