I am typing up all of a bunch of letters that my grandpa sent during ww2. I am going to get them printed in books for different family members. The site I am going to use for the printing accepts either .doc files or .pdf files. I really want them to look professional and every time I download pdf files they just seem to look better and more professional. What would you guys suggest to use to make it look the best? And do you have any tips?