Welcome to the forum!
I'd love to see your cockatiels, if you have any for us.
There are some articles on genetics, on the main website, so I suggest taking a look at them.
If there's anything that confuses you though, you can just ask Carolyn (tielfan), since she wrote said articles. She knows a thing or two about genetics and color mutations.
I'm still learning about it as well, though I could possibly share some of my knowledge. I'm better in the behavioral department of cockatiels (though there are things I'm learning still, but I've learned a lot already, from experience).
You're in Australia? Do any wild flocks of cockatiels ever bug your aviary tiels? That's always something I've been curious about, when keeping cockatiels outside in Australia, though I understand that some parts don't have wild cockatiels.