No special menu to order from. You order off the regular menu. The only thing that isn't included are any lobster offerings. With the CP you get an appetizer, entree, non-alcoholic beverage and a dessert.
There isn't a seating area for IllumiNations. It is a viewing area...everyone just stands and watches. It is set on a small incline, so those in the back aren't badly impacted by those further to the front. It did get crowded there though.
Even the seating for the actual CP show is first come, first served. Those with the ID for the show, having bought the pkg, will line up on the left side of the theater..facing the theater from the sidewalk. Those without the pkg line up on the right side.
About 15 or so mins before the show starts, those with the pkg will be allowed in to find seats. They are pretty much directed to particular areas by CMs. Then, about 5 mins before the show starts, those in the standby line are allowed in to find leftover seating.
Even with the pkg you should still head for the line about 45 mins before show start time. We get to the line about 40 mins before the start and we are waaaaay back in the line, back to Japan!!! But, the line moves quickly.