1) Wait until you get home
2&3) you will find them in your
MDE account, then you'll have to either download all or select certain ones that you want to download. The site will create .zip files for you (condensed files with groups of your photos in each .zip). When you're ready, you click on each one and select "download now". Whatever device you're on (computer, phone, etc) is where they'll be downloaded. I believe you can download to cloud storage as well, but it's been a little while and I'm not certain about that.
4) The Photopass area of the Disney site is where you'll find all the stickers, borders, character signatures, titles, etc. that you can add to your pictures. I like to download one whole original set first, so that I am certain I have a "clean" copy of everything; then I play around with all the special edits and download again. The site is pretty cool, because it knows where your shots were taken and suggests borders and stickers that match (i.e. when you're on Space Mountain, it shows you Space Mountain and Tomorrowland themed edits)
5) if you want to create a photobook or get prints, you can upload to Shutterfly, Snapfish, Walgreens, etc just like you would with photos off your own camera. Your downloads will include a copyright waiver that I always include with all the photos I want printed, because I have neglected it in the past and it slowed down my order when they waited for me to send the waiver.
You have until 45 days after your first picture was taken before they begin to expire (disappear off the site). I recommend leaving yourself a good amount of time before that deadline to make your edits and do the download. The site can be slow, if you're like me you'll spend AGES playing with the edits and enjoying the photos, you can run into computer difficulties. You don't want to be doing this at the 11th hour worrying about losing your photos. I will note, though, that lots of people have reported here that customer service is kind about giving extensions and offering help in those cases. I just wouldn't want to have to count on it!
have fun!!