Hi, Alexander. Since you are in Brisbane you might try the Planetarium at Mt Coot-tha. It's a great display with heaps of info etc about space and the planetarium talk and display is really good. The people there are also very knowledgable and answered my questions...and my (also) 14 year-old son.
There are also a number of amateur astronomy clubs here in Brisbane...but I can't recommend any because I am new to the hobby and haven't attended any meetings. Just do a Google search for astronomy clubs in Qld and you will get the details.
Good luck!
