In my case, my pictures were located on a memory card in my cell phone, which is what I used to take the pictures. I put the memory card in an adapter and plugged it into my laptop as a flash drive. Other devices will probably be more cooperative for you; most digital cameras utilize a simple cable to connect, or even transfer files wirelessly.
Save the pertinent pictures in their own folder. Make sure to keep them in the order in which they were captured. Some cameras have ridiculous naming conventions for the files they create, so this may be difficult. Windows does a pretty good job of sorting them properly if you select the "modified" option under "arrange icons by..."