Hamlet, Scene 1 Act 1.

Ok i'm confused. I don't get medieval talk at all, so i'm going to be lost this entire book probably. So there's two Hamlet's right? One is dead I think. Ugh I don't know. All I know is that the four characters introduced in the first scene: Marcellus, Horatio, Bernardo, and Francisco, are all guards, and their all friends. Three of them get freaked out by the ghost of the dead king Hamlet I think. Well hopefully I catch on soon :)