Hi,
I did my PDC there in January and it was a great place to learn. To answer your questions.
What should I pack?
What kind of weather am I looking at?
Here is a link to climate stats for the area
http://www.bom.gov.au/climate/averages/tables/cw_058037.shtml
It is subtropical so it will be warm and wet. It will get into the thirties regularly even though it is Autumn. Pack for summer but it may get cool at night so bring long trousers etc. and definitely wet weather gear.
What kind of tent should I get?
A good one that can stand up to high winds and pouring rain. I have seen peoples cheap ones destroyed in one storm
What kind of expenses am I looking at over the 10 weeks and a rough estimate if possible?
Most of the food is included so you just need beer money.
Easiest way to get to the farm from Brisbane?
Train to Lismore and taxi to the farm. They arrange a free bus from Lismore sometimes. You could ask Bonnie to email all the attendees and see if you can get a ride from Brisbane. I took someone up and two people back that way.
Enjoy yourself
Dan