Rhino is a good modeler. It is used alot in making props for Poser, from what I've heard. In Rhino, you just import what you want to work on (i.e., Poser character). Ask for the specifics in the Poser or Rhino forum. What matters is that you practice modeling and learn the fundamentals of it. It's not up to what software you use--as long as it's decent--you should be able to model anything you want. Just because someone has Lightwave or Maya doesn't mean they'll automatically be better at modeling. You want to model, so use Rhino and learn to model. They have plenty of tutorials in the Rhino forum. Stop sitting on your hands and go check them out.