Does anyone know how to do this?? I want to render my sketchup files. I'm using a mac. I read somewhere it needs to be exported as an FXB file, when I click export FXB isnt an option!

I am new to sketch up and need some help! I am making a library and want to make sure I get a really nice finish on it. I don't know anything about renderers for sketch up but have seen videos of stuff finished with one called "Vray".
Do I need this or is there another out? I am totally new so if someone could help me simply that would be brilliant!
Also, when rendering does the model need to be super neat i.e every excess line need to be gone? Please excuse my ignorance!