First read Bill Bryson's book: Down Under. If you're in the U.S. it goes under the title "In a sunburned Country." It's a must for any foreigner looking to come and experience life here. Other than that, ask as many people as you can (from wherever your homeland is) who have travelled Australia for their thoughts. Any true Aussie will tell you this is the greatest place on Earth, but most of us are biased, to say the least.
It's a beautiful country with as many different climates & landscapes as there are different cultures who pride this their home. Like any place we have our fair share of idiots but I've met a few in most countries I've been to. No more, no less. We're mostly friendly people with a knack for finding humour in adversity and there's a very strong, though subtle, pride in where we live and who we are. But we don't bash you round the head with all that. Well I try not to!
As for teaching in Aus, you'll find your skills wanted in Queensland & New South Wales arguably the most, followed by West Aus & Victoria. I have friends who are teachers (recent grad's & not-so) and they've been placed/assigned etc, in really good spots with relatively good pupils.
Try the government website: http://www.immi.gov.au/ for further details & info. Another site to consider to make sure you don't get taxed to the hilt if you work as a non-resident to check out is: http://www.ato.gov.au/. Probly best to compare how much you are taxed on your current salary as to what you might get taxed over here. To put it into perspective I guess. Depends of course as to what line of teaching you're in. Anyhow, good luck with it all and I hope it all comes together for you & your friend!