Hamlet Act uno scene uno

3. A few question that I have is:
Where does Hamlet tie into this scene?
When will we first see Hamlet?
Why exactly is there a ghost?
Is this scene necessary?

1. Pretty much this scene opens with a few manly gentlemen keeping watch over something. They are just kind of minding their own business keeping watch until a ghost appears that resembles the dead King Hamlet. Now this isn't the first time that they have seen the ghost before. They encourage their main man Horatio to speak to it. Eventually the rooster crows and *poof* he is gone.

5. My first reaction of Horatio is that he was some what important. It was just his presence. Once the subject of the ghost is brought up, he is the only rational person at the scene. When the ghost actually appears he is the first person to be brave enough to talk directly to it. According to Mr. Hill and my own intuition, Horatio will be a major character in this play.