When assembling a file, high resolution images should be used and written into the pdf.
Fonts Tab:
ALWAYS embed ALL fonts! Embedding fonts assures the integrity of the file. If the fonts are not embedded, every time the file is brought up on a different computer, the fonts will change according to the fonts available to it. Such an occurance defies the logic of a “printready” pdf.
Color Tab:
The high resolution images being written into the file are presumably, approved CMYK images properly prepared for high end printing. Leave all color unchanged.