They will ask for your flight information. That's more important for the trip back to the airport, as they'll assign you a departure time that's about 3 hours before your flight.
When you're going from the airport to the resort, there aren't any scheduled bus times that I'm aware of. Buses come and go continuously, so you don't have to worry about missing your bus. Just make your way to the ME area, and they'll direct you for the bus line for your resort.
Lynne pretty much hit the nail on the head there, you can also let the CM know at check in that you need the ME to the airport and provide the information at that time and they will take care of it then, then the morning before you leave they will slip a letter informing you of your pick up time. If unsure where to go just ask a cast member and they will point you in the right direction