All you need is already on the internet; however here is some stuff collected for you!
IRC channel
Join #Drupal8NZ on irc.freenode.net! (Don't know how? Here you go!)
Simplytest.me
Use simplytest.me if you are not set-up locally? ...> http://simplytest.me/
Simplytest.me is an online platform to test Drupal sites. All you ever wanted to know about it is here http://simplytest.me/qa
#Drupal8NZ tag on Drupal.org
We aim to cluster around a couple of issues and bounce them back and forth between us. Tags in use are:
Pre-filtered list to pick-up new issues
Nothing on our #Drupal8NZ? This is a link to the issue list filtered by Drupal 8 and "novice":
https://www.drupal.org/project/issues/search/drupal?assigned=&submitted=&project_issue_followers=&status%5B%5D=Open&version%5B%5D=8.x&issue_tags_op=%3D&issue_tags=Novice
Dreditor
Get dreditor for Chrome. Dreditor (short for "Drupal editor" and pronounced /'dɹɛdɪtə/) started as a simple idea for a (greasemonkey) browser user script to help module maintainers, Drupal core maintainers, and developers in general to review patches on http://drupal.org.
Do's
If you commit (or contrib) to Drupal.org as part of our Drupal8 contribution sprints mention #Drupal8NZ!
Tag your issues with #Drupal8NZ so that we can create our own "cloud".
Don't(s)
I don't have any Don'ts yet.
Still don't know where to start? Try...
Code Sprint Tasks
Plus some interesting issues/discussions:
https://www.drupal.org/node/2052473