Just to add to what's been mentioned, the hotels won't yet be fully booked, so no worries there, at all. We have been able to get a room in a hotel on the shuttle route two years in a row, after the summer email goes out (June-ish, the postcard will get mailed listing what hotels, what the rates are, etc.). So, don't stress if you cannot book right now, there will be space open. Although, the sooner the better, especially if you want several days, and if you are particular about having 2 double beds vs one king bed.
Bring a refillable water bottle with you (or buy bottled water, and refill those, nice and light weight!); to refill, head up to the 3rd floor and the Ozarka water things they have up there. For food, Chick Fil A has the most affordable options, but plan on at least $10/day for lunch (more if you go to other stops, some are up to $15 per plate), as well as $$ for dinner. Depending where your hotel is, there may or may not be much around that is open (the downtown hotels, such as Hyatt, aren't near many restaurants open for dinner, other than the hotel restaurant). Plan on $20-ish for a hotel dinner/more if you splurge.
Test out whatever tote bag you bring for ease/comfort. You want it able to be organized (so your wallet, phone, etc. don't get lost in it), yet a lightweight bag so that your purchases don't make it too heavy, and a comfortable shoulder strap (or a back pack) so it doesn't make your neck/shoulder sore. I have always done tote bags, but may switch to a back pack next year; easier to get around the aisles (not bumping your bag into people) and easier on the shoulders, even if less convenient of having to take it on/off (or wear it on the front).
It is likely to be warm in the convention center, so dress in layers if it's cold outside (it may not be). Don't pack your suitcase full, so you have room for your purchases. Don't be afraid to check out and have the hotel hold your bags the final day you are in town, if you do a late flight, they are used to it.
There are plenty of hotels not on the shuttle route that are also within walking distance, so if you don't find a room in one of the official hotels, check the maps and shop around.
Dress comfy, and come have fun!