G'day Nijba.
Forums are a fantastic place to share ideas, gain some insight and swap stories. Unfortunately, they can also be a source of great confusion and can erode some of the foundations your instructor will (should be) be laying and building on during your training.
Your questions are excellent and show you have a reasonable grasp of some of the basic concepts, however, your Instructor is the dude i would be discussing the more complex things with. He/she is trained to impart the correct information, at the right time and lots of pilots like to have a crack at explaining things as they understand them, which is where much of the confusion comes from.
There are a few subjects that you simply MUST understand properly to be safe, and some of those you have touched on in this thread.
Enjoy the conversations here, but grab a coffee, sit down with your Instructor and 'learn".