Anna Marina,
Like "all things", there is a context to "the beginning" of Genesis 1:1 and John 1:1. It is the beginning of the story of Israel, God's dealings with mankind.
Where do we get our information from. It is simple. As I said, the mere fact that the creation of angels are not mentioned should be a wake up call to the modern "Evangelical" tale. Secondly, the Hebrew text itself speaks of chaos "Now the earth was formless and empty, darkness was over the surface of the deep". It also speaks of rudely unscientific stuff like a sea up in the heavens.
Hugh Ross places Adam's creation between 55,000 and 230,000 years ago, it seems reasonable and probably the most scientific bet out there but it is based on the premise that Genesis 1 is history in the modern sense. I dont think it is.