Genealogy / Information on how/where to search to find out my father's history [9]

Hi there,
New to the forum, hoping to get some direction on where to look for information on my fathers history.
To cut a long story short, he was born in Poland in 1914 and was a POW during WWII. Once he was freed he moved to Australia where he stayed until he passed away many years ago.

I just don't know where to start to try and find out information.
Thanks in advance
Antony