you'll need a rain jacket, shorts, leathers and hail cover.....and you'll be wearing/needing it all on the same day! Just kidding, melbourne is a great city you'll love it, they allow bikes to park on the footpath in the city, although it is famous for frequent changing weather. However, you'll be able to ride all year round unlike what you're probably used to. There's also a good place called Central Motocycles in the city that has 750s, etc for sale so bring your dwindling dollar!
Welcome to australia.