Mental Ray is a bit advanced, have you even been shown this yet? If not, I would suggest rendering in Software with production. File types .Tiff. Not sure what you mean by multiple cameras, but in render settings you can select a camera to render, there should be a button there that allows you to add multiple render cameras, it'll render your frames for each of the selected ones.
thanks for the adivce.
Set frames from 1-160 but only rendering frame one, not the 1-160 animation? any advice.
Do you have enough space on your disk?