I suggest you created a custom page size for the Kindle in MS Word. If you print to pdf using and 8.5 x 11 inch document, you are going to have very tiny type, especially since we can't change font sizes on PDFs. If you create a custom size of 3.5 x 4.75 (you may have to play a bit with sizes to get it right for your needs), copy your text to the custom size then print to pdf, you'll have better results.
