How Do Teams Works on TheSame Scene/Project

We are a young team who recently started building a Great game in unity however we are having some about How should we arrange the working on a project, For example one team member going to build and place the houses the other will reach that Build scene/project easily then the other one going to place trees and other stuff and the all other members also going to reach that scene ejc. ( you know where i am going with this pattern) so what is the best way of doing this and please consider this is not a small game project and there will be also multiple scenes and projects for this game so it is huge, i really appreciate your insights, thanks in advance

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