Hi Ace, well that's a big question you've asked.
Firstly, you've made some good moves there straight off.
I'd also suggest you take a look at the following link, to check just what potentially might be able in the way of ADSl - Broadband in your neck of the woods: httphttps://register.bigpond.com/check-availability.dos://register.bigpond.com/check-availability.do
As far as duration is concerned there are a number of factors that can effect hook-up, availability of ports etc. at your local exchange being a major concern these days.
The best way to get a hands on picture would be to either visit your local Tesltra shop if that's possible or run through the steps at the following link, and utilise the contacts there, who would be better placed to advise a time-frame: httphttps://www.telstra.com.au/broadband/home-broadband#s://www.telstra.com.au/broadband/home-broadband#
While you're on that page, a live chat window should pop up and you can communicate directly with the right people for advice.
Jeff