Short answers, pulled from the story.
Tomb wall decorations and writings from the Old Kingdom between 2700 BC and 2200 BC provide the majority of information regarding ancient Egyptian creation myths. These records document the emergence of life from primeval waters known as Nu.
The Ogdoad system from Hermopolis depicts eight gods with frog heads and serpent heads who personified qualities of the primeval waters. Their convergence caused a great upheaval that produced the pyramidal benben mound from which the sun emerged.
Atum generated Shu and Tefnut, who created Geb and Nut, and these four produced Osiris, Isis, Set, and Nephthys to form the Ennead group. All other things in the world were seen as extensions of Atum within this narrative framework.
Ptah served as the patron god of craftsmen in Memphis who created through thought and speech rather than physical acts. Ideas developed within Ptah's heart became form when he named them with his tongue to produce all gods and objects.
Amun stood beyond the sky and deeper than the underworld as the hidden force behind everything in Theban theology. He eventually became the supreme god of the pantheon by unifying previous myths under his name and transcending all other figures in Egyptian religion.