It All Starts With A Group Of Primitive People is a Manga/Manhwa/Manhua in (English/Raw) language, manhua series, english chapters have been translated and you can read them here. You are reading chapters on ManhwaZ fastest updating comic site. The Summary is
Chen Liyi, who was shopping with a rich woman, accidentally traversed to the Stone Age, leading primitive people to fight beasts, build civilization, and become the emperor of this land. The system is in hand, the inheritance of technology can be obtained at will, Not only that, even the primitive people can also play with guns!