Student tickets are "free" at FSU as well. All students pay an activities and services as part of their tuition. Some of which goes to cover Student Union events (free movies, free concerts, free everything basically) and some of it goes to cover free Athletics events. For most sports, you just need to show up and flash your ID. For basketball you can do that but they also let you pick up tickets in advance (which is necessary for the big games, but not necessary otherwise).
For football, the current system is that you have to sign up online the Sunday before the game. Normally it's not a problem and as long as you sign up in like 72 hours you will be fine. Oklahoma tickets "sold out" in 17 minutes. If the Noles win tomorrow, I expect tickets to be difficult to get for the rest of the season. Alternatively, you can drop $20 (maybe $25) and join Student Boosters at the start of the semester and you are guaranteed tickets to all the home games. If you are smart you do that.
Back when I was an undergrad, you had to sign up online, you got a number, and then you had to line up outside the ticket office later that week. Then they called out numbers and you turned in vouchers (which you picked up at the start of the semester) in exchange for tickets. This was great because if you didn't want your vouchers, you could just sell them off to people that needed extras, and when you turn them in you can turn in up to 10. This was so you could sit with your friends, and only one of you would need to bother to wake up hella early to get the tickets. Now all the student tickets are general admission, which is also nice but it means you can't easily sell your spot since the tickets are print-at-home and have your name on them, and they do a decent job of checking IDs at the gate.
On the plus side, going general admission forces you to show up to the stadium early if you want a good seat. It's a good motivator for the incredibly lazy/fair-weather/tailgate-obsessed FSU fanbase who would routinely show up in the middle of the 2nd quarter after they had a good buzz going. Fuck those guys. Support your team, assholes.