You'll want to transfer the photos you want to print onto the flash drive. It's best to keep them organized in one folder. Then take them to a one hour photo place. Many stores can print off of flash storage including Target, Costco, and CVS. They can upload your pictures at the store and then print them.
Plug your flash drive into your computer. Then, transfer your pictures from the computer to the flash drive. Safely un plug it, then bring it to the photo place!
Flash drives are best option to transfer photos from one computer to another. copy the photos to the flash drive as u copy a file and can be printed later.
Upload your pictures from your camera to your computer, drag them to a folder on the drive, and take them to a Kodak, etc. printing station at a nearby store.