Will mc make an organization ? Or kingdom or clan ?

Not a kingdom or a clan. As for the organisation, I am thinking about it. I have some ideas in my mind. This is just one of the worlds that MC will be in.

What if he makes like an academy in each world he goes to and like teaches people about laws and stuff in exchange for protecting his his interests and the academy Something like the academy in god of poison

The MC in this story is a bit cold and ruthless. He is also very cautious and cunning.And he is trying to get strong as fast as possible due to the mysterious entity’s warning. I have thought about creating an organisation but I am not sure if a academy is fit for his character . In mind, it should something he can run by staying behind the scenes. Also , this story is not just an independent story. My idea is to make this into an universe like marvel. So there will be other characters in different novels. My plan is for each of them to control a different type of organisation .

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Make it a trading house or or something like those trading pavilions they have in cultivation novels

shame you added romance tag

is this harem?

Don't have a problem with romance. But for the love of everything that is sacred please, I beg of you, no harem. There is enough harem. We don't need more harem. It is fine and even realistic for the MC to have flings, but you should do as Supreme Magus did and choose someone for the MC to stay permanently. Also, please, wait until they are at least physically 16 for adult stuff.

Like, most people nowadays will not know if they are sexually compatible with each other until they try. There is problems of compatibility in sexual appetite, characteristics, etc between people. In the modern day you shouldn't feel bad neither think less of someone for trying to find someone emotionally and sexually compatible. This goes for both men and women. So, my point is that in novels it is not a problem to have flings, but I don't think most people really like harem. Because it is kind of demeaning for other characters and egocentric for the MC to not choose one person. People like to think that having more than one girlfriend would be nice, but imagine how hard is to show your vulnerable side to someone and multiply it by the amount of people in the relationship. I know I may be taking fiction too far, but I think that it molds behaviors and people and bad behaviors, can emotionally stunt people.