Photoshop is an advanced pixel/raster based photo editing program. It has evolved to include type support; but when you want to print your file, you must export it as a tiff or eps file.
Change rgb files to cmyk.
When creating duotone eps files, avoid using spot pantone black; specify the colors of your duotone deliberately.
Make your photo file resolution 300 dpi at final size. (1200 for lineart.)
Avoid lzw compression for tiffs.
Avoid saving your files as jpegs except for internet transport. Alert us when using this method.