When investing in .au domains, here are some things to consider:
1. Avoid .net.au as they are becoming increasingly difficult to sell for decent prices, or at all, even for strong single keywords.
2. Stick with .com.au
3. Think about who would want the name, how it would add value to their business and how much they would be realistically willing to pay in order to receive that value.
4. Research how many businesses use the term as part of their name, domain or marketing tag line, then consider whether they would be likely to perceive benefit in paying for a shorter domain.
5. Research how many businesses pay for the term in Google search ads.
6. Read, watch and listen to as much as you can about domain name investing before purchasing domains.
7. Proceed slowly. Purchase a few names using the knowledge you've gained and see if you can sell them. It's better to have a few quality names than hundreds of junk names that will never sell.
8. Only invest what you can afford to lose.