File > New
Set the Resolution to 300dpi.
Insert the Bleed size including the print margin.
Ensure you select CMYK for color mode before start creating your artwork. (There will be huge color difference when converting from RGB to CMYK)
*Note: : If you create your artwork with Photoshop, you will have to create your desired finishing layer using Indesign or Illustrator and compile the files together.

Select Press Quality on PDF Preset.
Be sure to specify PDF compatibility as Acrobat 6 (PDF1.5)
*Note : Follow the instructions below to create multiple pages.
① Save each design on PDF file
② Merge all the files and save any individual files into one single PDF file (Note : Link to Blog)

Select Quality Print on PDF Preset.
Be sure to specify PDF compatibility as Acrobat 6 (PDF1.5)