Is there a detailed account of what happened to Trayvon Martin?

I've read so many accounts and counterclaims, I'd like a clean version of what everyone is agreed on; time of day, weather conditions, etc. I'm curious about a couple items:

1. Was his younger brother was at home, and did Trayvon go out to get the Skittles for him, or was Trayvon on his own?

2. What was the time line of his father realizing he was missing, and the police getting around to contacting the family? (caveat: I had a teenage daughter go missing one time - we thought she was upstairs and she'd gone out to a movie with friends. I t happens.).

3. On every episode of Law and Order, the police "canvass the neighborhood". I think Trayvon was shot down 70 yards from his back door. I figure that makes it what, maybe 5 doors down at most? Yet no police officer was knocking on the door asking about the shooting?