Where should I start?
UFC 223. Gigantic lightweight fight, great all around card. Just...don't expect every card to be that stacked.
Where can I see the fight's (for free hopefully)?
PPVs aren't legally free, but on April 14, there's a good event on Fox, and one week later, a good event on FS1. Those are pretty common.
I want to learn as much as possible, so what should I study for bets? Style, ranking of an athlete/the technics?
There are a couple users here that do some good breakdowns. /u/fightsgoneby, /u/csardonic1, /u/dmarty77 do good work. If I may plug myself, I have a few write-ups posted here. Don't bet too much.
What fight are legendary and must be seen?
Michael Johnson vs. Justin Gaethje was amazing. Yancy Medeiros vs. Alex Oliveira was as well, both are fairly recent. To go back a bit, Robbie Lawler vs. Rory MacDonald 2 and Jon Jones vs. Alexander Gustafsson. To get a feel for the current champions:
Demetrious Johnson vs. Wilson Reis, Ray Borg
T. J. Dillashaw vs. Reman Baraõ 1 and 2
Max Holloway vs. Jose Aldo 1 and 2
Tony Ferguson vs. Rafael dos Anjos
Tyron Woodley vs. Robbie Lawler (that's his best performance but his recent ones have been less exciting so beware)
Robert Whittaker vs. Ronaldo Souza, Yoel Romero
Daniel Cormier vs. Alexander Gustafsson
Stipe Miocic vs. Junior dos Santos 2, Overeem, Werdum (they're short)