mystery questions- will jkr solve them and tell us what happened???/

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did voldemort try to go alone to godric"s hollow the night he killed harry"S parents ???if so ,how do people know the events of the night???if voldemort lost his body at godric"s hollow ,then who retrieved his wand????how did dumbledore know the details of voldemort"s murder of lily-how lv offered to spare her life and how the charm that protects harry was formed -if no one else was there to witness it??? these are some loose ends that i hope jkr will try to solve in the 7th book do we have any answers to these??if so pleasereply or atleast make a guess