It started with the "Original Source Family" souls. Humanoid life comprised of the "two cores" of energy some refer to it as the Kundalini where energy from a planet is merged with the individual soul. Once combined you have a sentient being.

It all started (I don't have an exact date) some 9 - 11 trillion years ago with the Drach race. They were basically comprised of dragon DNA. One male and one female that only lived for some 11 hours (earth time) on a planet 20 or so times the size of Jupiter. The bodies were created in the afternoon. They spent the evening together and went out hunting for food the next morning. Both were killed, eaten by a group of velasorapter type dinosaurs.

The Drach race is the oldest race in creation.