Go to windows explorer (go to my computer). Browse to where you installed steam.
For example "C:\Program Files\Steam" and from there click on the folder called steamapps, then your username, then click on the garrysmod folder, and inside that click on another garrysmod folder, this is where the garrysmod files are.
For example:
C:\Program Files\Steam\steamapps\<username>\garrysmod\garrysmod
"Program Files" or "Program Files (x86)," Steam\steamapps"Accountname"\garrysmod\garrysmod\maps
when you have downloaded an add on, extract the file to: :C/Program Files/steam/steamapps/<your user name>/garrysmod/garrysmod/addons. you put in maps to : :C/Program Files/steam/steamapps/<your user name>/garrysmod/garrysmod/maps.
Depends on what kind of things you want on your game for addons, and Maps get them off of GarrysMod.org Heres how you install them Program Files > Steam > SteamApps > YourUserName > GarrysMod > GarrysMod > Addons Program Files > Steam > SteamApps > YourUserName > GarrysMod > GarrysMod > Maps
when you download an addon, put in in program files, steam, steamapps, <your user name>, garrysmod, garrysmod, addons. extract all files to this folder.
Put addons in this folder: C:\Program Files\Steam\steamapps\<steam name>\garrysmod\garrysmod\addons
you open the thing then extract all files to "computer/os:c/program files86/steam/stemapps/YOUR STEAM NAME/garrysmod/garrysmod/addons well it depends most guns and tools go in addons any maps go in computer/os:c/program files86/steam/stemapps/YOUR STEAM NAME/garrysmod/garrysmod/Maps
first of all go to your garrysmod folder where you downloaded all the addons (should be my computer/local disk/programme files/steam/steamapps/*yourusername*/garrysmod) then delete that folder and then load garrysmod, a new folder should copy in that place and everything will be normal.
You put it in garrysmod\garrysmod\addons
well its just like addons really but if you are using garrys mod 10 theres a mp3 player addon and you can add your own music and sounds but theres a soundthing calledEasy Use BILLY MAYS EXOSOUNDSsearch that on garrysmod.org and download it then transfer the easy use billy..... folder with all the files in it to [if you use the steam version] program files/steam/steamapps/your user name/garrysmod/garrysmod/addons. just look for the folder addons in garrys mod folder if you torrented or not using steam- program files/valve/garrysmod/garrysmod/addons.check youtube too
I'm not sure which gamestartup file. But you can have background music when you start garrysmod, this file is gamestartup.mp3. The file can be placed here: <STEAM USERNAME>\garrysmod\garrysmod\sound\ui Hope this helps.
well go to computer your disk drive program files steam steamapps accountname then garry's mod garry's mod in that folder click screenshots
on addons ( steam/steamapps/garrysmod/garrysmod/addons)