Selling on Ebay America - Any tips?

I'm about to list a bunch of transformer items onto ebay in order to pay for a new car and I was wondering if anyone has had any experience in listing their items via the American ebay website.

Occasionally I see items for sale that are located within Australia but the bidding amounts are in U.S. dollars, and I can only deduce that the sellers have gone through the American website to set up their auctions. I would like my items to be more visible to international customers whilst still being available to Australians.

If I list my items for sale via the American website are my items still going to be seen in local search results for Australians using ebay.com.au? And are there any other points that I should take note of?