The various editions of Tyrone Thomas "150 Walks in Victoria" are helpful. More recently I've spent time on AllTrails https://www.alltrails.com/
looking at various Victoria trails that are logged.... maps, info and walkers individually logged walks (with photos etc). I've only looked at Vic but this is an international site so it would serve you equally well for the other states in Australia.
And, of course, there are lots of great route reports here, from all states.