Establish the core component of what you believe HR is. In most cases, this includes the employee handbook, policies, procedures, etc.
As things are run differently in each country, you need to assess the requirements that you feel are of high priority. For example, in Australia, I believe the company culture, training and development, and flexibility with employees' needs are at an all-time high. Along with increased demands for salary levels to be above the market rate, there are procedures and policies embedded within the company to ensure smooth operations.
Let me know if you would like any additional help.