Technically your booklet is your ticket. It has a barcode on it that Disney will scan when you enter the terminal. You will also need to print out the signature form and bring it with you to the terminal. So your booklet, the signature paper, driver license, and passport is what you will need to board the ship.
FYI, when you reach the terminal, baggage services will take your luggage. You will then go thru a gate where a Disney employee checks your id and scans your booklet.
You will then follow the pathway to a security checkpoint with x-ray machines. Your carry-on bag will go thru the x-ray machine and you will go thru a metal detector.
You will then go up an escalator where a Disney Employee will direct you to a table to fill out a quick health form. The health form basically asks is anyone sick, blah blah blah. You fill out one form per family, basically say no, no one has a contagious disease. If anyone is sick, Disney does have the right to not let that person board.
A cast member will then direct you to the check-in line (everyone in your party needs to be in this line). You will wait your turn (usually a very short wait) and go up to the check-in counter (just like the hotel check-in counters) where the cast member will take your health form and your signature form (that you printed from the internet). The cast member will also ask to see everyone's passport.
If this is your first cruise, the cast member will take individual pictures of everyone in your group. These pictures are not printed on your id. They are stored in Disney's database so when you disembark the ship at ports, Disney can match computer pics with actual faces.
After the cast member has checked you in and given you your
Disney Cruise card (room key/charging card), you will be directed to the waiting area. If you have kids, you can complete the kid's club check in process (I have no idea what this entails cause I don't have kids). The kid's club check in is near the waiting area.
The lobby has a cool ship replica that you will want to take tons of pictures of

. Also Captain Mickey or Minnie come out at various times to pose for pictures.
When it is time to board, you will hear an announcement. When it is time to board you will go thru the Mickey Head Arch to the gangway. Cast Members will be directing you and will ask to see your id before you go thru the Mickey Doors. Plus once you get pass the Mickey doors, there is one more queue where you will get your id scanned to officially register you as boarding the ship.
After that queue, Disney Cast Members will direct you to pose for your first Disney Cruise photo and then you will go thru one more door before you are finally on the ship. When you go thru the main door, a cast member asks for your family name, they announce it to all the cast members waiting in the lobby to cheer you on. I love that part, it is like you are a celebrity for two seconds, very nice!!! A cast member will then direct you where to go to eat and you now are free to explore the ship.
***LOL, I see I just wrote a book, sorry if I bored anyone, slow day at work.***