First of all, congrats on the J1 game, you earned it. Below, I have listed some advice/info from numerous bowl trips to Florida. Your opinions on Orlando may differ from mine, so keep that in mind.
1) First of all, unless you have a charter that gets you to to stadium,
buy a parking pass if you are driving (they sell out)! I would also check out Uber before I counted on them. It's ugly out there. I can't emphasize this enough. The area around the stadium is rough (the police will tell you this) and you don't want to park in an unauthorized location. Orange Blossom Lane sounds beautiful, but it is a dump. On one trip, the police pulled a body out of the retention pond in our parking lot; it did not add to tailgate gaiety.
2) Be flexible on where you fly into/out of. Orlando/Sanford and Tampa/St. Pete are only about 90 minutes apart. Fly into or out of whichever is cheaper (or even Fort Meyers, if you are staying there). On one of our last trips, the car rental was actually cheaper with an Orlando pick up and Tampa drop off. Go figure.
3) If the Allegiant times work for you, it is a great option. Both Sanford and St. Pete are smaller than Orlando/Tampa and you walk out of the terminal and go over and get your car. Like it.
4) Check out this website.
http://www.mousesavers.com/national-rental-car-discounts/ You can get into other car rental places besides National from the site. It has some good advice/discount codes.
5) Do you like Orlando? I hate it. On one of our last trips, we spent the night before the game at an Orlando airport hotel, then hot-footed it to St Pete Beach for a week of R & R. Sirata Beach Resort is a reasonable St Pete Beach hotel that I've stayed at a few times. Also, if you are staying a while or with a group, try VRBO.com. Unless you are going to the Keys, nothing is very far away in Florida.
6) The Doubletree where Gopher Lady is staying has had good reviews from some of our folks, mainly because of manager's reception.
Have fun!
Edit: I heard they have upgraded the stadium (needed) but doubt they have upgraded the neighborhood.