How do I make *.mdl files!?

Well I want to learn how to make *.mdl files because I want to make ragdolls, npc´s, props and stuff like that, now I´ve been “googleing” for2 hours and found…nothing so I´m asking here.

Programs currently installed (editing and stuff)
Sketchup 7
Gimp 2.6

Those should be enough
(sketchup for 3d modeling)
(Gimp for textures)

The textures for my (2) first projects are done^^
1 ragdoll
1 minigun prop

Post this here->http://www.facepunch.com/forumdisplay.php?f=40

Sketchup cannot be used for source modelling, get 3DS Max or Blender.

Im pretty sure sketchup can be for source, Probably not just the best…

[editline]08:24AM[/editline]

They even have it on the valve wiki:

FYI, This was the first hit i got for “Sketchup source engine” on google.

[editline]08:25AM[/editline]

And you’re looking for the SMD export, VMF is for use in maps.

Oh yeah I forgot the tools were released with L4D2