How did chemisty and oceans produce this?

Formation of Planetary Atmospheres:

Condensation of water vapor is crucial
Main steps in evolution of the Earth's Atmosphere
On this planet it was too cold for water vapor to condense. Hence the atmosphere is all Carbon Dioxide
On this planet it was too hot for water vapor to condense. Hence the atmosphere is all Carbon Dioxide
On this planet it was just right. The carbon dioxide content of the earth's atmosphere is now all locked up in rocks.
There are hence two keys to the evolution of planetary atmospheres:

Fate of the water vapor (gaseous, liquid, solid)
Fate of the Carbon Dioxide (stays in atmosphere vs. dissolves in liquid water)

After condensation of water vapor produced the earth's oceans, thus sweeping out the carbon dioxide and locking it up into rocks, our atmosphere was mostly nitrogen. Currently, our atmosphere is 72% nitrogen and 28% oxygen (everything else like H₂ and CO₂ exists only in trace amounts). So where did the oxygen come from?
So now let's make some life over the next billion years or so:

Amino Acids now loosely mixed in the oceans

2D view of glycine
3D view of glycine

Most amino acids have a mirror image (L and D)

L and D both found in meteorites
L only in organisms on the earth
why is D selected against?

So now we have some amino acids (monomers) loosely mixed in the oceans. Liquid medium is important:

Protects molecules from UV photon disruption
Ease of transport and Interaction

Next goal is to combine monomers into Polymers (peptide chains)

Example formation of a peptide chain

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