Open World Survival RPG

I already have the asset for day n night cycle . so , seriously asking where should i start making my game . Models ? done ! Game n scripts and stuff ? 0 ! please give me some idea ?
im looking to create a open world rpg game . not zombies no , its a survival rpg set in a modern time . Details : Torn building , nature consuming the cities , and much more . so , i already model some part of the city or town by myself , using blender . the only question is . how do i start with unity . wht should i do first ? GUI ? AI ? or something else ?

Please don’t make a thread if you have nothing to show. You literally have nothing. How about some pictures of the models? Storyline? Anything?

oh . sorry . will be uploading those.model later …

You posted this question in the works in progress section.

Start wherever, just start.