In this manga the main character is at first useless, but a system activates and directs him to look for talented disciples and after he did that he had to find a suitable place to create sect.
He went to a mountain that led to another small world/dimension which was blocked from the outside world by a fog.
This is The First Ancestor in History (AKA History's Number 1 Founder).
He transmigrated and got a system but Lin Feng’s pressure is as big as a mountain. System main quest: Ling Feng creates a school, establishing history’s number 1 sect, Ling Feng himself becoming the number 1 founder. And so to become history’s number 1 founder, Lin Feng started to work hard.
This image is from the first book, where the main character accidentally activates his system and learns that he is tasked with creating a sect.
