Take the North Exit from the airport to Route 528 and continue to I-4. I think there are two toll booths between the airport and I-4 at 75 cents each.
Go East on I-4 and continue to exit 75A (it's about two miles on I-4). You'll see the signs for the parking garage (which is on the right) and the various hotels, if you're going to one of them.
Dick Taylor