If the file is vector kkeep it vector. If it is a rster image try to keep it in the native format of the raster program.
If your image is vector and you print to PDF it should still be vector only in a pdf file. Keep it that way. You printer can either open in Corel or Illy as a vector file or into Photoshop as a raster file.
I dont use Illy but either export or save as JPEG at the print size. Keep the resolution @ no smaller than 300dpi. You will need to zip or stufit (compress)the file as it will be huge. That should do it.
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