I recommend that you read Culture Clash by Jean Donaldson. She can get you through a lot of these kinds of situations. Cesar Milan is not a behaviorist or dog psychologist. Most Phds in behavior view his ideas as archaic and showing a clear misunderstanding of our domestic dogs. He labels behavior in two ways; either dominant or not dominant. Domestic dogs are hardly ever dominant. They're simply untrained or undertrained. They don't know how to act in a human's world until they're taught. He reads body language wrong in many cases. Being excessively dominating toward a dog or being overly forceful, punishing does not build a working relationship with a dog. I want my dogs engaged with me and with what they're learning. It's school for them, not war against the dogs.
It's important to learn something about scientific learning theory...how dogs learn. They learn by reinforcement. If you give your dog what she wants while she's biting and lunging at you, she will repeat it. Everyone repeats behaviors for which they are reinforced or rewarded. What does she want? Is it attention? What do you do when she does this? Attend to her? You need to prevent a payoff for behaviors you don't want. And offer her alternative behaviors for which she can be reinforced so she will choose those behaviors instead.
Cesar Milan is right about a few things; exercise appropriate for the age of the pup will help settle her down. Several times a day, a good, hard romp outside, some running, fetching which you can teach, chasing a rope that you drag around for an outlet for her herding drives will help her be satisfied that way. Fun chew toys. Someone reminded me of a plastic liter bottle (top off) for a dog to kick around the house and pounce on. Pouncing, biting, chasing, grabbing are predatory drives and dogs need outlets for these, some more than others. The breed of dog you have needs a lot of that most likely.
Then start teaching basic obedience and make it very fun and rewarding. Your puppy doesn't know yet so if she doesn't do something, she is not being naughty. These skills; sit, come, down, stay etc will be useful to fill up her brain with things to think about and do INSTEAD of the no no. As she learns them, you make her successes, even baby steps very rewarding so she'll repeat them. When she's about to bite or jump, you can ask for a sit, down and reward for that. Those things will become the default behavior instead of the unwanted behaviors.
Obedience training using positive methods, motivation and reward will help her mature and will help behavior in general. It will also strengthen the bond you two have so she'll WANT to be engaged with you.
Look through the forums too. There are threads on attention training, teaching sit and stay, teaching a reliable recall (come) and a lot of other behavior issues.
Every dog is different. Your Aussie is most likely a much higher drive dog than some of your past dogs and needs more pro-active involvement. If she wasn't handled a lot as a baby, that too could set her back. Be sure to get her out and socialize her a lot every day. That is sooooo important. Get her around all kinds of things but make sure nothing frightens her.
I didn't mean to sound harsh but over whelming a very young puppy with a lot of intimidation, force, coercion, fear, discomfort (Cesar's way) is not the way to raise a puppy. Most of the well known, highly respected behaviorists and trainers see his ways as being very detrimental to our domestic dogs and are setting dog training back decades. We've come so far by studies, research, proof and practice that we know there are other ways which work so much better and produce a happy, willing, well trained and smart dog. We don't need to make them submissive and down trodden in order to have an obedient, well mannered dog. I certainly don't like the body language I see in some of the dogs he works with.
Another book, if you like to read, is Dogs, a Startling New Understanding of Canine Origin, Evolution and Behavior by Ray and Lorna Coppinger. Excellent, excellent book. I can't recommend that highly enough. You will see how and why it is extremely unlikely that dogs are pack animals and how we are not a pack member or an alpha or any of the other mumbo jumbo that Cesar talks about. Leaders, yes, but benevolent ones who engage our friends and how our dogs participate with us or live along side us. We have no business intimidating and highy dominating this other specie or a need to. It is NOT what is best for them, as Cesar proclaims.