Hi Tamara
Unfortunately it's not as simple as "she'll be right", there are very real risks, mainly because incumbent distributors and manufacturers have an interest to prevent parallel imports
Are the goods already being sold in Australia by an official distributor or distributors? Because those guys may have registered trademarks in Australia related to the goods, or have been granted an exclusive license to use those trademarks by the Australian trademark holder. And they might not be too happy and might actually want to slug it out with you (perhaps starting at the very least with a letter insisting that you stop immediately) if they find out what you're doing, see
here one of the more recent and high profile cases (admittedly the case does not concern a small business parallel importer)
Also, how sure are you that all the goods are authentic? It's sometimes difficult to know for sure if you buy from a source other than the genuine one
There's a start with a couple of risks that immediately come to mind, it'd be good to see what the other contributors say too, as I expect there'd be other hurdles. Cosmetics are generally expensive in Australia, so no doubt you'd have a few customers if you get past the legals. But yeah, legitimate parallel importation is not that simple unfortunately, especially in the last few years!!