Might be doing the same trip in May next year to Coolangatta in Queensland for a wedding. I found the following website useful - www.caravancaravan.com.au/ though to be honest I only found that site a couple of days ago.
Welcome to the gang Jen Star, enjoy here and out in the playground.
Have a look in "Camps Australia Wide" or "Wickicamps". I'm sure you will find some good spots listed. I check "Camps" first then go into "Whicki" and read comments etc.
Hope you find some nice spots. Enjoy and keep safe.
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Live Life On Your Terms
DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)