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Uk Foreign and Commonwealth Office
US State Department
Canadian Consular affairs
AUS$1 = 100 cents
Notes come in denominations of $5, $10, $20, $50 and $100.
Coins come in denominations of 5¢, 10¢, 20¢, 50¢, and gold $1 and $2 coins.
Cards credit or debit are very widely accepted. travellers cheques generally receive a better exchange rate than cash but are sometimes subject to a fee.
there are a great many web sites and companies who can help you with an application for any kind of Australian visa. the link below is the official Australian government site stating requirements for visas :
Australian department of Immigration