How does Australia tax imported goods?

Hi everyone!
We have been importing from Spain, China, and US. As long as dollar value is under $1000 AU there is no import or tax. We have several boxes delivered each month. Overall, more costly than a container but then again don't have to put out $10,000 to fill a container.

Australian customs site shows the duty for different items.

We shipped a container 4 months ago and found that Clothing is usually most expensive (upwards of 15%!) Our electric goods were 5% and another product was 0% . If you can't find what you are looking for they have been very helpful to us over the phone.

Go for it!!

Hi everyone!
I've recently joined salehoo and think i have found my niche product which i can source from china via DHgate. I've also found an aussie supplier whose products i will give a try.
Firstly, im a bit confused about declaring imported goods. A search on customs website gave me this info
- Imported goods valued at or below A$1000* that arrive in
Australia by sea or air cargo must be declared to the Australian
Customs and Border Protection Service (Customs and Border
Protection) on a self-assessed clearance (SAC) declaration.
SAC declarations are not required for the clearance of goods
with a value at or below A$1000 that arrive by international mail
(post).
My items are under $1000 and will be sent via FedEx. Is that classed as international air mail or air cargo??
Also, at which point do i need to declare my profits as an income in my tax return, or apply for an ABN?
Thanks in advance