As someone who is looking to do this in Adelaide, I'll tell you what I'm doing.
I'm lucky to have an epic shed at my parents place which is decked out with equipment. The thing to do next is to get more and more people training with me and a reasonable membership.
First thing you need to do, is find somewhere to train. Start small, 40 square meters is more than enough for 2 platforms, 2 racks and 2 benches. It won't be pretty but it will work. Then is the real tricky thing, do you put 5 grand down and affiliate with Markos? In doing so you get much cheaper equipment to deck out. Or do you try to find your own equipment and wait till you're somewhat established before you affiliate.
I am extremely lucky that my parents agreed to the large shed, and when we shut down the Adelaide Weightlifting Club I took in most of the equipment. This gave me a huge head start, but that's what you need to consider.
Then you need to get people in and training, and YOU need to be there every time, all the time. I would not recommend you train, you need to prowl around and keep your eyes out at all time, train on your own time. I tried training with the group and it was not fun, gotta keep your eye out, rush to spot someone, make sure they aren't going to slam a bar through the wall, heaps of things.
But best of luck!