I'm not sure if I need to because all the videos I see on the internet say you have to open the game in order to find the files, but other places i see thati only need the gun files, help?

no,you don't need modren warfare or black ops to use them ,go to this website to see your weapon if it already published http://www.cfgfactory.com/downloads/category/387/1/time/20/DESC

or this one https://mega.nz/folder/6QlWSYZY#yFtmc5-2lIFyr2ak5l64dw/folder/CA0T1YwA
or you need the game and ugx weapon editor,and open ugx weapon editor and port the weapon by pressing file and choose your game file and simply adding the weapon into your mod