Yes, most definitely search Youtube, and get a better feel for the sport. You can pretty much check for any fighter, and there's usually a highlight someone made.
For DVD's, get UFC 49 & 47 first. Both are exciting, and there's never really a dull moment.
Find Frank Shamrock vs Tito Ortiz from UFC 22. This is just me spewing my love for Frank Shamrock, but the fight is my favorite fight of all time. Just an incredible battle where conditioning plays a huge factor. Find some 1994-1996 Pancrase tapes as well. Highspots.com has some.