[Johnny9ball]

For you first question you should model with Sub-D's Try the Mclaren tutorial or better yet the Strat tutorial. There are also teniques for low poly modeling but im no expert on that never really did any low poly modeling. With Sub-D's you can dial up or down the number of polys depending on how smooth you want it to be.

For your second question go to render options then render mode drop down list, and choose wireframe.