This sounds like the work of a developer. If you want to take a plot of land and sell it for $2x/m², it’s entirely possible… But it may take $3x/m² worth of improvements if you’re not careful.

Frankly, if you have to ask these kinds of questions Lemmy is not the place to get the answers. You can get a college degree in this kind of thing, and it seems like you’d need to start at the very basic level.