Before you leave home you'll get a packet that will have special luggage labels for Disney and your Magical Express tickets. The luggage labels will have the Disney logo and the name of the hotel that you are staying in. Once you check in at the airport you won't see your bags until they are delivered to your room. When you land in FL you'll go to the Magical Express Counter and check in. They'll take the tickets and you board the Magical Express. When you get to your hotel it can take an hour or two for you to get your luggage so you might want to bring something in your carry on bag. The day before you return you will get an envelope with the time that you will need to be at the bus stop. It's usually 3 hours before your scheduled departure time. You'll need to bring your own bags to the bus stop, they don't automaticly get them. They'll drop you off at the departure gate. I don't think they stop at every gate, I think it's in between gates.
Have a great time!!!!!!!!