Just change your privacy settings.
no, they cant see anything you do, and you cant see anything they do!
You report them . Got to their profile press report/block this person.
When they can't view your profile I'm sure that they will conclude something.
You get a Facebook profile by going to the Facebook website and setting up a profile.
Somewhere in settings you can choose to keep somethings private (Don't show_____ on page) or maybe on edit profile it'll say something like (Don't show ______ on page)
if u mean block a person click on their profile and scroll down on the left side there should be (if ur friends) Suggest friends Unfriend Share Profile Report/Block this person press delete then block if ur not friends it should look like this Share Profile report/block this person
you block them.
If the person is stalker you can block his profile for you. And if the person is your friend you can poke back.
who is viewing my facebook profile
No, once posted it's open access.
go to their profile and where it should say add this person, should say something like block this user
Just do whatever you want. It is okay to block whoever you want. If it is none of their business, then block them if you want. There is nothing wrong with it.