Garrys Mod addon help

Hi, I am fairly new to garrys mod and I have just started downloading new addons and mods from the Garrys mod website. Every Tutorial I have viewed has told me to extract the files into either my gmod folder or my addons folder and I have tried both. However when I open Garrys mod and I attempt to find the addons in the main menu I have no clue where they are or how to open them (I have seen only 1 actually appear in >main menu>extensions>addons but it will not open) Can anyone give me some simplified instructions on how to make this work?

  1. Your addons folder is in your gmod folder D: Mine is:

C:\Program Files (x86)\Steam\steamapps\itsthatmatt\garrysmod\garrysmod\addons

  1. Every add-on you put on, does a different thing. What Addons have you installed?

i did this too. and i’ve found the file but i cant figure out how to get them to show up in garrys mod

Is the addon thing missing an info.txt? Check this tutorial out for information on how to make info.txt and what they can do http://wiki.garrysmod.com/?title=Creating_an_addon