Okay, so back to the Miami conference... According to speaker Donna Jo Napoli, there are a few things that a first page just can't live without:
(1) introduce the main character
(2) introduce the main character's problem, or at least something that will lead to the problem
(3) introduce the "hook" - what kind of story it is - a buddy story? a story about school?
(4) introduce the tone of the book - Scary? start with a creepy sentence. Sassy? start with snappy dialouge
Bottom line: Hit the ground running!