Go to a hostel in Bundaberg, look at the wall. Or call a hostel in Bundaberg and ask them now. I don't think anyone offering fruit picking jobs cares about 'a guy who's going to move to australia in three months' enough to ever reply to an email though. The only people who would reply to that are the ones who will charge you money for it, there are too many kids wandering in each day looking for work on the spot to talk to someone on the other side of the world who probably is just daydreaming and won't ever turn up anyway.