For entry into an Australian LLM the requirements are typically a pass degree in law. I have been told by friends that some better institutions like University of Melbourne MAY require international students to complete the 1 year LLM in 1.5 years instead.
Besides the first degree requirement, i think all universities have an english requirement. The IELTS requirement and conditions for waiver vary from institutions to institutions so I am unable to provide specifics on this aspect. If your LLB was conducted in english then I would think there is not much to worry about :)