Traveling to Australia?
You must have a visa before you can travel to Australia unless you're a New Zealand citizen. Which visa you need for a stay of a couple of weeks depends on your passport country. https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-finder/visit Visa options for visiting Australia
Everyone needs a visa to visit Australia for any length of time except New Zealanders. To find out which is the best visa for you look here https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-finder/visit
We don't know what you need. It may depend on what country you are a citizen of. Why don't you google 'visa australia'? Find a government website and read it.
Sorry, I'm from America.
The only non Australians that can enter Australia without a visa are New Zealanders.
Depends on your citizenship.
Chances are you'll be eligible for a 90 day visa with only a passport. But given I don't where you're from you're going to have to look it up yourself.