I am a book writer. I wrote this year a book and it is the first time I want to get my book published. Now, I have the soft copy of book in MS Word format, I set the page size to A4.
The situation is I have footnotes, some explanatory points at the bottom and some images arranged in relation with A4 size. I want to ask, if I make a PDF file of my work (A4 work), will there be any problem in printing this to any size of page on which I want to print my work? Because I am not in a position  

to change such a huge number (500) of pages to set them according to some required page format.