Noob Guide?

So I recently got garrys mod and I am still getting used to the whole addons/mods for the game.
Wondering if there is a comprehensive guide in general for noobs for installing mods and entities. DLed a ton of buildings/entity props that came in the form of a .txt with code in it and I have no clue how to implement all of this. I got the basics of placing everything into the /garrysmod/addons folder.

Any kind of guide(s) that can help with this and other various installs for under-experienced players.