Nice begining. :) I really like how Sirius asked and got Remus to be Harry's guardian. I like how much material you covered in the first chapter, and I like how you used different things (dreams, letter) in it. The only thing that really stood out to me as wrong was "He was aware of neither the tap at his door, nor Aunt Petunia and Mrs. Figg peering in at him, as he was bathed softly in the early morning sunlight." Umm... so I guess that Mrs. Figg came over to the Dursley's house, went upstairs and saw Harry napping on his bed in his room? it seems a little off to me.