Forgive me if this has been discussed before.
I own an Imac, and have just purchased a Sony PRS-505.
I want to create a document I have, and want to format it as neatly as possible. I have read that I need to create a page size of 3.47 inches x 4.54 inches, however, what font size do I use?
I will (I guess) create it in PDF format.
(I have not received my Reader yet, so want to spend some time formatting my document in readiness for its arrival - it is my Grandfathers Diary of the 1st World War).
(I do not want to simply convert the document as I want to take special care of the formatting.
Any help would be greatly appreciated.

Chris