Applying for the Z visa.

I am an Australian citizen looking to move to Guangzhou China to start freelance work for a Chinese Company. I understand I need a Z type, although I will be working for myself, is the Z type the best one for me?

With applying for the Z - I understand there are medial checks and documents that are needed in order to apply, am I able to have these checks in Australia and provide these forms to the Embassy in Australia? Or will I need to have the medical checks in PRC and complete the application once I am in there? If all is completed when I am there- what do I get to enter first to then proceed with the Z application?

I have had previous business types before when working for an Australian company. Also can you please provide me with an example of one of the supporting documents I need to apply?