Answer:
First, You would want to save it as a jpeg or png because they would most likely not have trouble uploading it in that format.
Also, You would also want to send them the images that look the best and allow them to choose which images they want in their photo album.
Finally, You would want to put them in order by the time or moment that they were taken so that they will be easy to find. Preferably, you should put them in a folder with their name on it so that it is easy to find the photos so that you don't accidentally send them someone else's pictures or pictures that you do not want seen by anyone.