I'll ST but I'm only using the core rulebooks, nothing from clanbooks or outside sources and no bloodlines.
And since the setting will be pre-Camarilla in the Near East one clan will dominate with no princes or other roles it will be one powerful Elder, her children and favored outsiders that she allows to stay in the city-state. And you will have a choice you can OPENLY be a vampire a servant of the city goddess or not be open and live among the mortals. Both have advantages and drawbacks.
Your rivals will be vampires from other city-states, Hebrew hunters and holy men and women and any family bickering that may happen.
If your interested the leader will be a Daeva so should most of the vampires in the city, Ventrue don't exist and there are no Covenants it will be very basic. The city can support many vampires slaves are easy to feed from, most mortals are willing for the pleasures of the Kiss and gifts and well if your in the open your going to be treated as nobility even if you were once a common whore. But everyone will know your not human.
Hidden ones aresafer from hunters and enemies but haveto hunt normally its less ,reliable, and spotty.