There's actually no periods and hebrew, and some days have more than one sentence even in english translations. That Genesis 1:1 is someone separated from the rest of the chapter is a made up modern view with the purpose of enabling the millions of years secular naturalists believe in.
And yes, the creation week is the absolute beginning for the world.
There are no periods/marginal punctuation but there is context. It would be a lie, and a deception to say that the Bible is compiled in a way that it required advanced Hebrew knowledge in history and language to understand - after translated. God won't let His word become a labyrinth of language, no matter who tried to mess with it.
It is very clear that the earth was created in the beginning, with HEAVEN. It is also clear earth was created before God separated light, made the celestial bodies, and even before a day was designated (evening, morning). No literal gymnastics needed. Even in the many definitions of the Hebrew - the deeper meanings - a child can still gather that there is a chronology in Genesis: a sequence. Earth and Heaven were here before it all.
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