All domestic and most overseas travel is now "ticketless" or "Electronic." All you will need is you PNR number (confirmation) from airline. If Disney did not give it to you all you have to do is call the airline and give them your flight information (date, flight number, name) and they can give you your confirmation code.
Once you have this code you should be able to bring up your reservation online on the airline's website. You will also be able to check-in for your flights and print your boarding passes before leaving for the airport, usually 24 hours in advance, and you can go to the airport with your boarding pass in hand.