Wow..
fresh PPLs.
Wow.
How many aircraft ?
What type of aircraft ?
How many actual pilots ?
Some of your sectors are fairly lengthy, and what's
your bladder endurance ?
Take money..
lots & lots of money. (Prices are higher in the non-coastal areas., and the airport fees at Sydney will take your breath away)
Take BP, Mobil and Shell carnet cards for fuel.
Take along more money and emergency water and food and then tell at least 1 passenger that they can't go due to weight/balance issues.
Take reading material.. the weather will
not always be CAVOK (especially near the coast where there are any mountains, eg Parafield)
Wow.
I like your enthusiasm
, but I'd recommend doing some shorter duration trips first.