Do I need an ABN to earn money for selling my own Cds of my songs? -

If you sell more than $75k / year (1 Jul to 30 June), and you are carrying on an enterprise (not a hobby) you will have to register with ATO for GST and will be issued an ABN. Go visit; http://www.ato.gov.au/businesses/content.asp?doc=/content/13285.htm pc=001/003/021/001/008 mnu= mfp= st= cy=1