Glad to hear mtbdirt is still going strong! Essentially you’ve named the major trail centres. I was a regular at Daisy. It does get busy and with limited trails you need some local knowledge to enjoy some “less utilised” trails. I’d suggest riding the known local stuff first as you will soon learn or spot the other trails. And most of these are XC type stuff that I would ride on my old GT HT.
Mt Coot’tha is a proper fire road slog but the cafe at the top makes it worthwhile. As for bush riding, beware that Oz isn’t keen for you to ride in the reserves, so again ask around.
Lots of roadie stuff and Lbs’s but I don’t know of any major online Oz retailer.
Great climate, food, coffee and drink too but watch out for the Wildlife :)