A recap of this series canon: In the 1992/3 series of 'Conan The Adventurer', Conan of Cimmeria began a quest to restore his parents and grandfather to living flesh after the 'Spell of Living Stone' was cast on them by the Wizard Wrath-Amon. Doing so resulted in his taking on the Dark Wizard and his minions, the Serpent-Men, reptillian humanoids who could assume a human guise unless they came into close proximity to 'Star-Metal' that would shatter their illusions. Contact would send them into the Abyss where their Diety, Set, the Snake-God resided. He sought to free himself from his dark dimension and enslave the World, as he sought, and failed to do thousands of years before.
Wrath-Amon's predecessor, Ram-Amon was one of his Chief Servants, until, fustrated with Dregs - the Naga's - constant failures, created for himself a new servant/slave out of an ordinary Gila Monster. This creature would take advantage of an opening presented to him by Conan to steal the Black Ring of Set, and claim the position of Chief Servant of Set, becoming Wrath-Amon. Until the time of his final defeat where he would be reverted to his original form by Conan.
The Queen of Stygia, Mesmira, had a crush on Conan, and wanted him for herself. She was also responible for turning the Wizard Greywolf's brother and sister Meesha and Sasha into wolves. An act that was only partially reversed and not fully fixed by the series end.
Jezmine. Offspring of human and serpent-man. Carrying the blood of two species in her veins. Has romantic interests for Conan.
So who's story will you write? You can use any character that featured in the series, no matter how short the time. It can go any way you desire. And from any starting point you wish.