G`day John, Importing is a fairly simple process.
We recently imported a cnc router from China, and regularly import classic cars from the USA.
First question - What size is the mill? Shipping is done by either LCL ( less than container load ) meaning that it will be put into a container with other goods, or by FCL ( full container load ) which is a much more expensive method as your machine would travel solo.
I would assume that the mill would not be overly large so LCL should be the way to go.
Your supplier in China should be able to quote a price for the shipping. They will crate the machine and arrange to pack it into a shared container. They will provide you with all of the paperwork, including a "Bill of Lading" and fumigation certificate etc. The container will be put onto the ship and be offloaded at your nearest port. Be sure to request insurance as containers sometimes fall off the ship in rough seas.
You will need to contact a Customs Broker in your capital city who will make all necessary arrangements for Customs clearance and also organise delivery to you from the port. Be prepared for some expenses at this end such as approx $150 for the Broker charges, port charges, GST, etc. Get an approximate cost from your Broker before you order the machine, or you may get a nasty shock.
It will probably take about one month from when the mill leaves the factory in China to when you receive it.
Hope this helps you.