Acres in Sydney? Wont happen..there is none. there are some acreage properties in the suburbs ringing Sydney (1 to 2 hr commute by train in peak hr) but id expect the rent would be a couple K a week, To buy they would be 3 plus mill id suppose. remember the medium house price in Sydney is around a mill.
Great city Sydney, lots going on and beautiful. Melbourne's a hole. Adelaide has some serial killers and lots of churches, Tassie is full.
Most well known pot growing area would be Northern NSW hinterland. But you can grow outside just about anywhere (Tasmania isn't the best as its a very short season. But that's OK as Tasmania is full)
Hope the move goes well.