Both the Parliament of South Australia and the Parliament of Australia have good online resources for students and teachers.
At the Parliament of South Australia school's site you can access student parliamentary debate resources, votes for women resources and information on school and public tours.
At the Parliament of Australia's Education Resources site you can access resources for students and teachers, info sheets, Senate Briefs as well as an overview of the parliamentary system.
At the Electoral Commission of SA you can find out about the election process, enrol to vote and access a proportional representation count process and example.
At the Australian Electoral Commission you can access their education page with has classroom resources including Federation Fact Sheets, Ballot paper templates and a map of all federal electorates in Australia. There are a range of online DVD's which explain how votes are counted.