Admin/virtual Assistance

We are a new company in the health care industry in Perth Australia.
We would like an admin/virtual Assistance to complete some task like:
-Admin tasks
-Responding to leads via email
-Sourcing out bulk printing and distribution services
-Assistance with marketing tips to get more business and leads
-Keep on top of our social media accounts and helping us in joining the appropriate group
-Website blog creating and posting on social media accounts
-Assistance in getting T-shirts/uniforms for our employees (source out a supplier and liaise with them to print and deliver )
-When we get employees we would like the admin person to manage all employee start up documentation collection things like make sure we have collected tax details etc (we have systems already.
-Advertising for new positions at different platforms
-Appointment booking on calendar ????
-Any adhoc jobs as requested.