Reference images and tutorials are the best place to start.

Tutorials teach workflow and workflow is critical to using the software efficiently.

Working from references (w/orthogonal views) as you are learning to model will help you to more accurately gauge size and proportion.

As you continue to develop model from 3/4 views and photographic references (like the chair image above). From what I have been told, in real studio environments you rarely get nice clean orthogonal references so eventually you either have to draw them yourself or learn to work from the concept art which is usually non-orthogonal.