What happened in the First Phase of our Atmosphere?

1. Earth, at the Start, was Molten. Virtually no Atmosphere appeared 2. Then the Surface cooled and a Crust was Made, but Volcanoes then Appeared and Erupted, giving out Gases from Inside the Earth 3. Those Gases was Carbon Dioxide, Steam, [Water] Methane and Ammonia 4. So the Atmosphere now is Mostly Carbon Dioxide and Water Vapour, which then Condensed to make the Oceans. -Important to note Oxygen was Non-Existent