Help with converting gmod models to css.

I am adding some models to a server and i was wondering how to convert Gmod models to CSS player models and then how make a pack no model in particular just wondering.

Garry’s Mod has no player models.
They’re all mounted from other games.

I just mean getting the models from Gmod to CSS.

[editline]11th February 2011[/editline]

I guess a more specific question would be how do i make models as in people skins/models for CSS?

[editline]11th February 2011[/editline]

Actually Can i just drag and drop?

Come on guys please help.