I was sent it by my case officer but you can also down load it from the immigration site go to immi.gov.au and foloow the links to the forms and booklets. If you have little to nothing to do with him I would advice you get all of them signed together. Be aware that the statutory declaration must be signed in front of a magistrate or notary public as it has to be witnessed, he will require ID for that as well. The same person can certify all of your documents at the same time. I know how hard this is but believe me I am now just waiting for the visa approval and it is worth the wait and the hassle, even though you don't feel like it is at the moment. Good luck. if you need a statutory declaration let me know and I will send a PM to you containing the one I used.