How do I apply for a green card for my wife?

Hi there,
I’m an American citizen and I just married my wife who is from Australia.
Which forms do we need to submit? How do we go about submitting them? and what are the fees associated with them?
What are the average USCIS processing times?

We would like to prepare the application ourselves, because I don’t think we can afford an immigration attorney.

Can anybody point me in the right direction?