How would I go around making maps looking similar to valve games?

As the title suggest how would I make maps looking similar to games like half-life, l4d, etc.
I already know that I will need a lot of textures and 3d models, but the problem is I don’t know where to get them, I tried searching things like gmod assets, unity store, valve textures but I don’t find any that can help me produce something similar to valve, a good looking example in roblox would be nico’s next bots.

If someone can help me produce such I would be grateful.

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The best thing you can do is model them yourself in blender or go to the blender asset store.

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I am not really talented in making models, but essentially I just want textures.

Find some texture online through something like ambientcg and polyhaven websites.