Downloaded Models - Inserting them?

Hi,

I downloaded a few models from Gmod site and wanted to use them within Hammer to place… Can this be done? Can they even be edited via face poser?

I get lots of VTX & VTF files…

I’m guessing they can only be loaded via GMOD?

Is there a site that people publish models for source in .mdl format so we can use in Hammer and faceposer?