I've driven from Davenport, Iowa twice and Terre Haute Indiana once so I've travelled many of the same roads you will be. I would suggest taking the Florida Turnpike to I-4. Once you're on I-4 there are many signs telling you how to get to the Walt Disney World Resort area. As for the specific exit numbers, I can't help you there as our trip to Pop Century this past January we flew in and travelled to the resort via towncar. For great info from a transportation expert I would suggest sending a PM to Chip 'n Dale Express. He works at Guest Service at Pop Century and he used to drive the Disney Resort buses, so he knows the ins and outs of getting around down there. Good luck and have fun.