The thought of starting research can be daunting, so a great starting place is a hidden gem of an eResource - Credo Reference.
Credo Reference is a collection of over 800 reference eBooks with full text articles, images, and videos covering a huge variety of information - for all ages.
To show you how it works, I have started by searching Anzac Day.
Top result is from the eBook Holiday Symbols and Customs.
This title covers the origins of the day, and symbols and customs such as Dawn Service, Anzac Day parades, and the Australian gambling game Two-up.
From the results page, Credo offers you a Mind Map tool so you can search other related topics on Credo. Below is the example Mind Map of Anzac Day. You can then find information on certain battles, Gallipoli, and other remembrance days. List of sources will be on the right side of the page if you want to read more about any of the mind map headings.
Credo is a great place to start your research, it is easy to use and using tools like Mind Map it can take your quest for information in a different directions.