How do I install Sims 3 mods?

I've recently obtained a copy of Sims 3 since I've last it's predesesor "Sims 2" and I'm stuck on installing package files. Like my copy 1.0.631 version, do I copy the .package files to the directory (C:\Program Files\Electronic Arts\The Sims 3\Mods\Packages) and then outside the folder, place a .cfg folder in, open the .package files from the configuration file? That doesn't work! What did I do wrong?
 
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