Installing props and stuff?

I want to install props and ragdolls like zombies or L4D chars ( I converted them) So where do i put them at? Which folder. I tried addons and it didn’t work

If the folder has an info.txt file in it, the folder goes inaddons. And I mean the whole folder (EX: L4D Characters), don’t separate its contents inside the addons folder. Other than that, I don’t know. That should work; I’d imagine the props ARE addons.