If you intend on trading, then you will need an ABN at the very least, freely available by contacting the ATO. If you are only getting the samples to satisfy your own concerns, then you will need nothing at this point.
When you are considering starting to trade, I would suggest seeing an account to make sure you understand your taxation obligations, and book keeping towards that goal.
You will also need to work out what your business structure is going to be, for example sole trader, partnership and so on.
If you are going to trade in any name other than your own, you will also need to register that business name. Contact you local licensing authority in NSW or the Consumer Affairs Department for details.