The research guides at the State Library (Vic) are great and cover many subjects but I have found this guide particularly useful with secondary students. It focuses on Australian soldiers who served in WWI. Topics: soldiers, battles, medals, personal stories and more.
Ergo is a site containing a great deal of information about Victorian history, including digitised primary resources. It also has tips on research skills and essay writing.
Improve your research, essay writing and study skills, explore Victoria's history, and access over 700 original primary sources you can use in your assignments.