First you need to go to a hosting site, I will use imgur.com as an example.

Press Upload from computer, find the files you wish to share. You can select multiple files by using ctrl+click or shift+click. Then you just press upload and when it's done you post the "Direct Link (email & IM)" to each of the files on here. (You can cycle through multiple photos by using the Prev Next buttons in the top left corner of Imgur.

Like so:

Hope this helps.