G'Day Will
The equipment you require will generally be suggested to you by the person who adopts you for the day, according to the species being targeted. They may even be able to provide you with a spare outfit, so you know exactly what to purchase if you want to pursue those fish in the future. Line weight, leader weight, terminal tackle and lures can all be discussed prior to hitting the water. If you're intent on purchasing a new outfit, let them know your spending limit so they can advise you accordingly. Some of the things you should consider taking care of personally are:
NSW Fishing Licence (unless exempt)
Suitable attire for weather (Hat, wet-weather gear, footwear, etc)
A drink and some tucker
Money to cover expenses such as fuel and bait
CAMERA
Make sure you discuss your level of proficiency with the mentor too. Provided you can cast reasonably accurately, can tie your own knot and have a general idea of lure or bait fishing then the hard work is behind you. If you struggle with these basics then at least the mentor knows where to start and may suggest a tutorial on the bank before you venture out on the water.
When you're out there, watch your mentor like a hawk! They can teach you those small intricacies that lead to cheshire-grinning success. It's a great time of year to learn, with most species starting to get quite active now. Good luck mate!
Cheers
Hodgey