How do you invite a person from another country for a visit (preparing documents)?

What documents are needed, where to go - just about everything. 'Cause I've no idea how this process works.


Of interest are Australia (as the host country), and Russia and Ukraine as home countries of guests.
How do you invite a person from another country for a visit (preparing documents)?
The simple answer is that you don't.


Anyone wanting to come to Australia needs a visa, different types of visa for different types of visit, and these are obtained by applying to the Australian Immigration Authorities.


Follow this link to the very informative government site and take it from there:


http://www.immi.gov.au