Well..... Prepare yourself for information overload.
Depending on which side of Chicago you live on, plan on a 3 to 4 hour drive which will put you there between 8:00 and 9:00am. If you are going this Thursday(tomorow you will have a few days to get acclimated to where some things are at. Depending on how long you are going to be there will have a lot to do with how much you will get to see, and how much time you will have to spend in a certain area, or talke with people.
I would suggest that you get on EAA's website, or go to
www.airventure.org there is a ton of info on there to the uninitiated that will be helpfull.
If you are an EAA member, and are planning on Camping I would suggest that you stay right there at Camp Scholler. It is the BEST place to stay. Take a bicycle, Moped, or something similar that will help you get from your campsite to the entrance gates. You cannot take them inside the gate to get around the convention grounds, but they will definitely make life much easier after spending the whole day walking around. At the very least a good pair of walking shoes will get you around. There are many places to fill up with water on site, so take a water bottle to keep you hydrated.
There is something going on all the time, so check schedules and plan your attack as best you can. The North end of the main runway 18/36 is where the main contingent of Warbirds gather, everything from L-birds, observation birds, primary and advanced trainers, fighter, bombers, and everything in between. Some of these will be featured at Aeroshell square as well, but most of them are at the north end. Get there early in the day, as that area will get closed off at about 1:00 to 2:00pm depending on the day so that they can prepare for the afternoon airshow, as the warbirds are in the afternoon airshow daily (except usually one day, Thursday I my memory serves me) I usually will be down there most of the morning and early afternoon, and then make my way back to show center (Aeroshell Square) in time to catch the afternoon airshow.
Take care of yourself throughout the day and if you are going to be there all week, then pace yourself.
Have a great time.