you asked many questions, and that is good, it is better to ask and be sure than to make naive mistakes. that is the first step.
Now you get many answers here, and you got mostly all the necessary information. It will be nice if you confirm that you understand all things that other members write to you, or if you need something to explain in more detail.
This is not a rule, but it would show that you are really interested in what you asked. Not just a burst post count or attempt to derive some merit.