Keep in mind I've never sent anything to Australia, but my hubby has. (He sent a motorcycle shock and it cost $80, due to weight).
Yes, but it costs more.
Hubby said that is the right chart, so that is prob 80% true.
He also said that if it weights more then the 20lbs limit then you are "screwed", that is what happened to him sending the shock.
You just have to fill out the customs form at the PO, just like if it were only going to Canada.
Yes, paypal converts, I don't know how but I guess it does.
Just remember that you can only sell retired products....
Also, remember that stamp sets are deceiving and weigh a LOT, at least when there is more than one.
Hope that helps.