You should consider converting these to EPUB files instead of PDF. My experience with Sony is that the EPUB files are handled much better (and faster).
You can use Calibre to convert DOCX, ODT and RTF formats directly, if you have the files in some other format you can use LibreOffice to convert them first to DOCX (make sure you have an up-to-date version ...
Setting the title of the PDF:
File menu / Properties / Description tab, Title field.
Setting the author:
Tools menu / Options / LibreOffice / User Data tab, fill the First name and Last name fields,
File menu / Properties / General tab, tick the Apply user data checkbox,
press the Reset button (it's near to the Apply user data checkbox).
The Reset button ...
I don't know if this is exact enough, but based on a combination of my own manual measurements and specifications listed in the user guide (warning links to pdf directly):
Screen resolution is 600(w) x 800(h) pixels
Screen measurements (approx, done myself) are 92(w) x 122(h) mm
Using this calculator, that gives us a dpi of approx 44.
Approx measurement of ...