PM is personal message.
And you're not giving me a whole lot to go with there.
Specifics like camping, motels, hotels, etc. How many days you want to take to go from Auckland to Wellington, etc, are all pretty useful information for me to help you.
If you have all the time in the world, then I can route it through tiny back roads all the way, but if you have some time limitations, then there are compromises.