These articles walk you through perfoming various tasks with Wall Worm Model Tools and 3ds Max.
The Level of Detail Generator on the Level of Detail Tools Rollout lets you generate LOD models from the root mesh. The tool will make lower-res versions of your model so that less polygons are rendered in-game when players move farther away.
Making a ragdoll requires you to use the hierarchy tab in the command panel, which may be a new area for less experienced modelers. Watch the video here to get a basic overview of how to make a ragdoll for Source.
$jigglebones are bones that can automatically generate secondary motion without being animated. Making a $jigglebone in WWMT requires you to use the hierarchy tab in the command panel, which may be a new area for less experienced modelers.