Unfortunately I can't give you a precise answer. At last check there are only a handful of Aussies on here, and you are the only Mexican I know of who is currently active. (Those not in Australia won't understand the Mexican comment, most Aussies will...)
What I can say however is that I don't know how many amateur musical / dramatic societies work, I believe that some do pay techs, but when you are at the bottom of the ladder, as most of us start out, I would not be expecting to bring home a pay cheque. So bear that in mind, look for experience not cash. As for finding a society, have you seen any advertising for a production by an amateur society lately? That might give you some contact details for the society. Otherwise Google might be able to help you.