When it comes to graphs and statistics the recency matters, especially at a time like this when the global economy has drastically changed. In regards to the topic "Australia's Trade and Financial Flows" and "Australia's Place in the Global Economy" the Reserve Bank website
www.rba.gov.au is a good place to start. For "The Global Economy" the OECD and IMF websites have some very comprehensive data. Also for a "Global Economy" case study, check the website of the central bank for the country which you are studying.
In terms of graphs that basically means your price mechanism (and the effects of any economic policy instrument on it), PPF, tariff/quota/subsidy graphs and 5-sector circular flow of income model.
Oh, and it may sound nerdy, but quote as much jargon as you can think of, the markers like it.