Concerning item 1, Genesis 1:31-2:1 "And God saw everything that he had made, and, behold, it was very good. And the evening and the morning were the sixth day. Thus the heavens and the earth were finished, and all the host of them."
Exodus 20:11 "For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it."
According to scripture, the only thing that could have existed before the creation of Genesis 1:1, was God himself, in eternity.
Concerning item 2, I haven't looked into that, but given my response to item 1, you can probably imagine my current impression. LOL
Concerning item 3, here are a couple of documents (attached) relating to the subject of 2 Peter 3:8.
I believe that Genesis 1:1 was the creation of time, space and all matter. I recently posted a question for discussion on this subject as well, "An Engineer's Perspective on Creation'. Perhaps that would be a better location for these discussions, since this post was intended specifically for the timeline from Adam to the Exodus.