Hi Brodie and welcome!
The best site to find information about schools is
http://www.tki.org.nz/e/schools/grap...akura_District
This link takes you to the Papkura listings.
Decile ratings (1 = lowest, 10 = highest) are an indicator of the socio-economic level of the area, and the received wisdom seems to be the higher the decile, the "better" the school, i.e. parents can afford to support the school, which means the school is not going to be deprived of resources. However, just because a school has a lower rating does not mean that the quaility of education will be poor. I think it's down to visitng them and getting a feel for them, but this link will allow you to research first.
We have been in touch with schools in a different area of Aucklnad and have found them to be really helpful,
Good luck,
gil