I think the problem here is while you insist you know what the role of a Flight Dispatcher does, we don't. You're asking for our advice on how to get the role but we don't understand the role you're asking about. One of those asking for clarification is a former Qantas pilot.
Explaining the role (as you understand it) will help forum members answer your question. Without it I doubt you will get what you're looking for.
I summary, help us to help you.
