Hey, basically you can get the visa yourself,
but I think that if you looking for the easiest way you should get an agency that will help you,
that’s what my brother did when he migrate Australia, he used this agency called The Australian Institute of Immigration,
he sais there really great and helped him a lot…
that’s there website:
www.ausiom.org
its a good, well known, reliable company. you should give it a try.
this agency can get you invitation documents set to get the visa, their email is
Goodluck