Welcome to FT tortuga444

Your itinerary covers four continents - even though you don't touch Asia, you have to pay for it when travelling from the South West Pacific (New Zealand) to Europe

ex-VIE/MUC/ the base prices are EUR2500/7019/12977 for Economy/Business/First Class
To the base price must be added the various taxes, fees and surcharges which depend on where you go and which airlines you choose to fly.

On oneworld.com you can see the full fare rules, which Ire commend you read so you can maximise the value of your ticket. Also there is an on-line booking tool there, which is full of bugs but should allow to at least price up various itineraries that you are interested in.