21 Day Australia + New Zealand

Hi Guys,

I'm planning a 21 day trip as follows:

7 Days - Melbourne
? Days - Sydney
? Days - Goldcoast
? Days - Newzealand

The number of days that I'll be staying in Sydney, Goldcoast and Newzealand is still not confirmed.

Does anyone have a good itinerary that I could use ?

I've been trying to find information all over the internet but can't find much related to what I'm looking for.

As this is my first time planning a overseas trip, would appreciate if some people over here can give some advice.

Thanks alot in advance
Nycky