Which part are you asking about? What is unclear? You need to be on an LMIA exempt closed work permit with your employer named on that work permit. That's what the first bullet mean. The second bullet says you must have worked for that employer on that closed work permit in Canada for at least...
It looks like you are on a PGWP or other open work permit. Is that correct? If so, you can only qualify for the 50 job offer points is your employer gets an approved LMIA.
Yes, you can return. The sooner you return the better. You should then be prepared to remain in Canada for 2 years without leaving. Note that when you return, there is some possibility that you could be reported at the border for failing to meet the residency requirement.
She should definitely show her own funds / savings. This is quite important.
You don't need to show a flight. It's not really a tie of any kind. Plus you don't want to buy flights until the TRV is actually approved.
You can certainly leave Canada. Just please be prepared that you most likely won't be able to return on any sort of temporary status and will lose your protected person status.
I'm not sure how the process works exactly once you are already a protected person. However you'll need to notify...
Yes, she can. You should withdraw sponsorship to cancel her COPR before she lands and becomes a PR so they you dont become financially responsible for her for thee years.
At least one of you must be living in Canada in order to sponsor your child for PR. That is one key requirement. Yes, you must be in compliance with the residency obligation to sponsor.
Your expectations are entirely unreasonable on getting a response. If you want an immediate response, hire a lawyer. People give advice here for free and you need to show a lot more patience. You posted this question at 6am EST. Most people in Canada are still sleeping at that time.