Celebrant courses
There are plenty of Celebrant courses in Melbourne (and Australia) to choose from. Like, lots.
You have the flexibility of choosing to study online, or in a classroom environment (some have a bit of both... blended learning I believe they call it).
Truth be told, I’m not sure of the quality (good or bad). I did the cheapest one I could find and it was fine.
Here’s a non-exhaustive list:
Australian Celebrations Training
Certificate IV in Celebrancy (Box Hill institute)
QualTrain celebrancy courses
The Unleashed Collective
Feel free to check them out. All of the folks who run them do a great job.
My Celebrant Buddy is a fast-tracked version of these courses, It utilises an online learning management system to present a series of fun, easy-to-follow lessons.
All up it should only take a few days to a week to complete.
Plus – as a very experienced Celebrant – I’ll always be on board to help. I also take of the legal obligations too, so you don't have to worry about it.