Hi Francisco,
I am a big fan of Disney's Online Check-in Service - its so easy and makes the check in process super fast once you arrive.
Beginning 10 days prior to your arrival, you can go online and confirm your information. On the
Disney World Resort homepage, you'll see "My Disney Vacation" next to the small orange suitcase icon near the top left side. Click "Online Check In". It only takes a few minutes to complete the information.
When you arrive at your resort, there will be a separate line for Guests who did their check-in online (look for the signs). The person whose name is on the reservation will have to present his or her photo ID. They will give your welcome package with your Key to the World Cards and resort information and you're good to go. It’s that simple.
I think you'll find Disney's Online Check-In Service very convenient and much appreciated if you've had a long day of traveling because it gets you to your room faster and lets the magic begin.
Wishing you many magical memories :-) Allison