What does your current supervisor for your Masters say Lissal? Are you hoping to extend your Masters study into a PhD thesis or do you want to try something new? Have you discussed your wish to go on and complete a doctorate with your current supervisor? They may be able to help with references, information and support.
Personally, I don't think it would hurt at all to email potential supervisors at Monash and express your interest. No doubt you will still need to go through the regular processes and applications for scholarships and stipends, which will be pretty competitive, especially for Monash, but I would imagine some, if not all, of the academics you email (regarding future doctoral supervision) will respond with encouragement and information that would be helpful.
Best wishes, P.