A muppets guide to Lightroom 5 print module

Page

In the Page tab you can set the background colour that will show as borders in between images.
You can also add a logo/ID plate and set various parameters for opacity and size and whether in front or behind the images also watermarking and cut guides.

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When in Single Image/Contact Sheet layout you have extra Page Options if enabled.
Including the ability to add page numbers Page Info crop marks
and Photo Info under each image from a dropdown which can be the filename or other meta data.

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Print Job

In the Print Job tab you can select whether to print to a printer or a jpeg you can also set various other output parameters resolution sharpening, size and colour management.

The Custom File dimension and Jpeg quality become available if you select Print to Jpeg otherwise the page size should be set for Printer under Page Setup tab (Screen Left hand column btm tab) which brings up printer settings
The unit of measure used in Custom File Dimensions is set under the Rulers, Grid & Guides tab Ruler Units.

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