First of all you posted in the wrong forum.
Try Presentation, you will get a lot more help there.
However, for now look at;
Document>Creative Imaging>Photo Rendering Settings.
You might not want to use Lightworks (try Internal) it might be easier to control, but you should get the idea.
This is where you control rendering quality/Size to final output to PSD or Tiff etc.
If you set low values here you will be fighting an up hill battle.
Then after all these settings, and assuming you get something you like in 3D,
and while you are still in 3D window; Now save-as (say) MyBestRender.psd to where ever you want to store it.