Writing about the narrator will give you the much to work with since he is the major character. "Araby" is an initiation story in that he loses his illusions and grows up to face a cruel reality by the end of the story.
For your three points, you could discuss him in the beginning, as he reads the priest's books and dreams of romance with Mangan's sister. He is romantic and naive.
Then you could discuss his growing obsession with Araby and what it comes to mean to him. He thinks he can bring romance into his life.
Finally, you could examine his character at the end of the story when he is so disillusioned once he has been to Araby. He is very different from the boy he had been.
Make sure that you state each point clearly in a topic sentence and then explain it. Don't fall into the trap of simply telling the story.
The enotes links below will take you to helpful information about the story and the characters. Good luck with your paper.