1. I don't know.
2. Inform one of the GMs and they will make sure that you do not get banned. I did the same thing when my brother wanted to create an account(unfortunately he doesn't play any more)
3.There is a Private League thread. Just type - Looking for a PL and you will get dozens of offers.
4. I dunno, I think you will be removed from the PL.
5. Yes you do.
Hope this helped!
"Falling in love is not at all the most stupid thing that people do but gravitation cannot be held responsible for it."