Where do i start with making a game like Crossout mobile

You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve? Keep it simple and clear!
    so im trying to do a game like Crossout Mobile
  2. What is the issue? Include enough details if possible!
    the problem is, i know how to make it but i dont know where do i start, i need some meshes like fenders, cabins, and a lot of other, i searched on roblox for packs but didn’t find anything and i dont know how to export to roblox from a .obj file or whatever it supports
  3. What solutions have you thought of so far?
    idk i tried searching for packs and everything, got basically nothing because roblox’s searching is kinda broken and everything and i dont know how to import any meshes into roblox + dont even know if there are any in the web

i would appreciate any help, i just dunno where to get any packs to begin the project and everything