Take the north exit out of the airport onto Semoran, left at first light onto Frontage/McCoy, left at light onto Conway.
If you are going directly to Disney, take another quick left here to get on Toll 528 (Beach Line). One 75 cent toll (watch for and use what looks like an exit ramp to pay tolls using cash).
Then you get to I-4, go west (southwest) for Disney.
Returning directly to airport via I-4 east to 528 east -- get off 528 at its exit 9 (Tradeport). Left and cross under, get into middle lane. Required right onto McCoy/Frontage, next light is 436 (Semoran). Right for airport entrance.