Speed hacks are installed for Garry's Mod by downloading the application and running it. The game is then loaded and the appropriate hot key is pressed to activate the speed hack.
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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.
I don't know what kinds of hacks you're looking for but there is a speed hack, regular speed hack, wall hack, no fog hack, infinite zoom hack and more. Just look for the hacks of banjo1 on elitepvpers. He has lots of hacks for metin2.
Put addons in this folder: C:\Program Files\Steam\steamapps\<steam name>\garrysmod\garrysmod\addons
Yes. Your xbox may have to be modded before allowing unrestricted download. -- No, but you can install mods on your xbox.
There is a method to load custom SSBB hacks off your SD card through the stage builder. I'm not entirely familiar with the process, however you can find more information here: http://brawlplus.net/install-guide/