well if ur after booze then u definately have chosen the right country!
well seeing as u'll be travelling with the pund id take over what the visa requirement is since u will be working. now as for working with bars you do need a certificate. im from new south wales and in my state you need an RSA to work in a bar. you can get one in sydney on george st just on top of the dymocks book store.. ask anyone on the street and they will tell u where the bookstre is, costs around 100AUD.
as for getting arund id punt on the bus, the journeys are long since its a big country but u can see alot more and the train is abit expensive so id go for the bus
now definate places to see for a good time are
1} Kings Cross in sydney.....sex drugs and rock n roll
2} Byron Bay NSW
4) tweed heads QLD/NSW border
5) Airlie beach in nrth QLD a must see
and there are plenty more if u wanna drink there is guaranteed a pub in every town and the cities are teaming with clubs, pubs and bars