Is a checked bag included with my flight?

I booked an international flight from the US to Australia via Qantas. When I go to baggage it says included baggage: 0kg x2 then when you view more details it says (Up to 23kg/50lb each and 270cm/106in in total) so I'm not exactly sure what that means?

Also!
Next to it, it says carry on allowance: cabin bag combination +1 personal item. What's a cabin bag combination? I assume it's just a small carry-on sized bag that's included?

Sorry! This is my first time flying and besides the paperwork stuff, I'm not exactly sure how any of this work (specifically around baggage/airports).

I ordered a package a while ago, and the tracking number has not updated in two weeks?

I ordered a tablet cord from a china on December 17th 2018. Two days later, the package was apparently sent to an airport to be shipped overseas. Ever since then, the tracking number hasn't updated. It's now January 3rd, 2019, not too long before the package should be arriving at my doorstep (Average from what I heard is 15-16 business days). Is this normal? Should I be worried that my package isn't being tracked? What should I do?

What were retro logo flight bags for?

I'm talking about the logo flight bags such as the Pan Am and American Airlines bags. I've come across a definition on Wikipedia saying they were for flight related manuals, documents and equipment for the pilots. However, I've also seen photos of both passengers using logoed bags from the flight they are on are carry-on luggage and all flight attendants having one as standard issue. This is in older images of early commercial jet travel.

Where would these bags have been obtained for the public who used them? Did you get one sent to your address after booking so it would be ready for the flight?

And would flight attendants have used them for their own carry-on luggage or just for airline specific equipment?