You need an ABN to carry on a business in Australia. This ABN is used primarily by the tax office to identify transactions from your business. You need an abn for tax purposes, registering a web address (domain), and creating tax invoices.
More Information : Apply for an ABN
Easy, You can do it online at the ATO website. Look at the bottom of this page for a link to their website.
Easy, You can do it online at the ATO website. Look at the bottom of this page for a link to their website.