1) You can move all Nazgul and Minions with a Character die.
2) No Nazgul may move to a Region that contains a Free Peoples Stronghold, unless it is under siege.
3) Using a Character die, you just move them there (unless the Fellowship is in a Region that contains a Free Peoples Stronghold that is not under siege). When a Hunt occurs, they give you one re-roll, no matter how many are there.
"War is much more fun when you're winning!" - General Martok