we planned to visit Shanghai and Beijing on 21 September for 19 days

My husband, my daughter and I are Australian Passport holder and we planned to visit Shanghai and Beijing on 21 September for 19 days. What visa we need and which one the address we have to apply visa Level 1/140 William St, Woolloomooloo NSW 2011 or Address: 39 Dunblane Street, Camperdown, NSW 2050, Australia?
Is everyone have to come when we load visa application form?
thanks so much