Start by selling a few small items that you can easily wrap, or put in a bag or box.  You will need a set of scales to weigh your parcels.  Parcels under 500 grams can be posted to any address within Australia for $7.95. Over that weight goes by size, weight and distance. The eBay website will automatically calculate postage for you and add it to your listing if you put in the size and weight of your parcel when you list it, and select "calculated postage"