In order to send your files efficiently and completely you must package your files. If you are working in InDesign you will need to make sure that your image files are properly linked before you start, then go to File > Package. This will put all of your images, fonts and InDesign file in the same folder. You will then want to Zip or Stuff the folder to compress it for quicker delivery. If you are unsure of how to check that your image files are properly linked, simply go to View > Links and then you will see the window for your links. If anything has a red circle with a questions mark or yellow triangle with an exclamation point. You MUST address these issues before you package your file. Otherwise, those files will not be included in the final package. Therefore, slowing down your production schedule!
If you are working in Photoshop it is best to have all of the images (TIFF or PSD) in one folder. DO NOT compose text in Photoshop, as this program does not render text properly when printing to inkjet printers. You will then need to Zip or Stuff the folder for quickest delivery.