There are a few of us Meade Melbournites who get together sporadically.
Have a look over here on Yahoo, and you can keep an eye out for the next events. There was one on Saturday 20th October, but there's no real rhyme or reason to when we get together.
http://tech.groups.yahoo.com/group/MelbMeadeScopes/
There are a couple of people who have ETX125's as well, who may be better able to give you specific answers on this equipment. Unfortunately, I have no specific knowledge of this scope or how to hook it up, but if it is anything like most Meade scopes, you need a RJ12 cable (serial cable), and some kind of program to tell it where to point.
Turbo