I'm not a breeder either, but am on the fringe of the Australian cat fancy. I know who is who, and what's going on. I can't really advise on how to sell kittens, I personally avoid places like the Trading Post, if you PM me, I can give you some places you might try.
I will say this...keep your nose clean at all times. Avoid trouble makers like the plague. No matter what a breeder tells you, if it's unethical, don't ever do it. Cutting corners ALWAYS comes back to bite these people on the bum, believe me...I know how gossipy the Aussie cat fancy is. There are some absolutely fantastic breeders out there, and as alicat said, finding a mentor will be quite beneficial, but start off on the right footing, and never stray from that path.
If you do the right thing, you will end up with a good name, and a good name in the breeding world really counts for a lot.
Sorry, just thought of some more stuff. I've seen some breeders who are constantly advertising kittens for sale on certain forums (not this one). They're almost begging, and some of these kittens are being sold at ridiculously cheap prices, just to get them out the door. What this tells me is that these people are breeding more kittens than they can find homes for, and I don't think that's right. Another thing you mentioned about putting buyers off with questions, most genuine kitten buyers don't have a problem with a tonne of questions, don't worry about that. Never compromise, if you have a gut feeling about a person, listen to it. I've heard this said time & time again.