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The majority of the planet was volcanos causing volcanic outgassing. The magnetic field keeps the volcanic gasses around the planet thus creating atmosphere.

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Oceans were filling the world with no life yet. After the oceans filled the only life on the planet at this point it Cyanobacteria. Cyanobacteria are bacteria the live on the surface of the ocean and produces oxygen.

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The Cyanobacteria caused a lot of oxygen to enter the atmosphere. So much oxygen that it killed almost all life on the planet. Eventually the planet cools down causing our current atmosphere.

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At this point the oxygen levels have dies down and life as a whole is able to recover and largess life forms appear.

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Throughout the entirety of the earth nitrogen has been in the atmosphere. Nitrogen is generated in the earth and gets released into the atmosphere because it is not stable and does not like being a solid.