If Rhia wants to learn, it would probably be easier for her to learn a modeling program (or Marvelous Designer). If she wants to start out with something free, perhaps Blender is the way to go. I'm not a Blender fan but I know there are a lot of Blender users that could help her out.

The main reason modeling isn't covered in the Poser tutorials is because there are so many different modelers (Blender, 3DS Max, Modo, LightWave, Cinema 4D, Vue, Silo, ZBrush and so on). Not only that, but someone could be using a version of the software made in 2016, while another could use the latest and greatest. Hence, the reason that Poser tutorials begin with the assumption that the OBJ file is already modeled for the Poser figure. 

Blender might be something for you to check out next, Rhia!