Howdy Michelle!
PhotoPass+ is fabulous and has become a must have item for our Walt Disney World vacations! I'm so glad you plan to pre-order it prior to your vacation.
As I'm sure you know, currently, if you order PhotoPass+ at least 14 days in advance of your vacation, you can purchase it for $149 (compared to $199.95).
When you purchase PhotoPass+, a voucher will be sent to your home. Be sure to include the voucher with your important travel documents as you will need it to pick up your PhotoPass+ card. Once you arrive at Disney World, stop by one of the Camera Centers and pick up your pass. You will find Camera Centers at the 4 theme parks as well as Downtown Disney. If you are not able to get your PhotoPass+ card immediately, you can combine standard PhotoPass cards with your account.
Be sure to take pictures of your PhotoPass cards with your personal camera in case any of your cards get misplaced. You will need to have the numbers on the back of the cards to retrieve your photos.
If you happen to visit an attraction where your PhotoPass+ card can be used but you don't have it with you, be sure to write down as much information as possible (time, photo code, location, etc.). Then, return to the attraction or one of the Camera Centers and ask to have the photos added to your account when you have your PhotoPass+ card with you.
When you arrive home, you will use the code provided to you to order your photos. You will receive all of the pictures associated with your PhotoPass account as well as a copyright release so you may use the photos as you wish.
If you have any further questions about PhotoPass+ or need any other information as you are planning your vacation, please let me know. Thanks so much for your question and have a magical day!