Romeo speaks first.
Those are the first lines of Romeo and Juliet, by William Shakespeare
Rosaline is the girl that Romeo loved before he met Juliet. She is only in the beginning of the play and she is only mentioned; she doesn't actually say anything. Romeo chooses to go to the Capulet's party because he thinks he will see Rosaline there. Except Rosaline doesn't love Romeo back
that juliet and romeo are maried, but both dead.
Romeo, Juliet, the Prince, Benvolio and Friar Lawerence. There are probably many others but those are the main ones.
Nobody asks any of them. They don't hear about it until after Romeo is dead. Montague does not appear to be an unreasonable man, and might have seen some profit in a merger between his family's interests and those of the Capulets. But of course nobody asked him.
Everyone in the play except Paris and Romeo. Notable among those who did not want to marry Juliet were Friar Lawrence (he was sworn to celibacy), Capulet (he was her father), and the Nurse (they didn't have gay marriages back then).
In Act 1 scene 2 Paris asks Juliet's father if he can marry her. However, in Act 1 Scene 5 Romeo also starts getting ideas along those lines.
Not all states have a Romeo and Juliet law and those who have are all different so no answer is possible unless you name the state this is about.
There are a number of fights in Romeo and Juliet, but if you mean the one in Act 1 Scene 1, the Prince, Escalus, stopped it.
The nurse tells juliet to forget Romeo and marry lord Paris. Obviously this is unacceptable to Juliet so she brushes the Nurse off. It's a problem because Romeo and Juliet have few enough people they can trust, and they don't need to lose the confidence of those few.
Juliet does not know about all of those things we just saw happen in Act 3 Scene 1: the fight between Tybalt and Mercutio, the fight between Tybalt and Romeo, Tybalt's death, and Romeo's banishment.
An example would be when when the Nurse after returning with news from Romeo goes off into a long talk about her health and that Juliet should be ashamed of sending her on such a long journey. The audience during those times found it hysterical