1. You really need to do some research. If your wife studies qualify her for PGWP her WP time will be related to how long she studies. If she has a full-time job in NOC 0, A or B and 3 pay stub you would qualify for SOWP.
2, All depends on your circumstances. You still have to qualify. You will have to look at your CRS scores and the various immigration programs
3. Yes but nothing is guaranteed. Your family has to qualify like everyone else. You should do your research before she applies for school so you both can make a plan.
Please take off caps. It means yelling and it's hard to read.