-Compound lifts (deadlifts, squats, OH press, rows, dips, chins, bench, cleans, etc.)
-Lower rep ranges (1-5 reps per set)
-Proper rest, diet
-Proper periodization / progression
I agree 100% with this answer, yet if you are going to face a professional fight you should seek advice to design a program focused not only on strength, but on power and conditioning as well as flexibility.
You need peak shape in every aspect. There are lots of programs, books and videos about strength training for MMA.
If you want to have a quick look, I compile a selection of the best workout videos I find on the internet in my website MMA Training Revolution
. Take a look, it will give you lot of ideas.