You'll need functional strength both to help your MMA and to prevent injuries. I am by no means an expert in MMA training, but most guys I know that are into it do the basics, and it is what I would recommend to any athlete. Squats, pulls, presses.
Maybe lift twice a week.....say Mon and Friday and do a squat, a pull, and a press.....you can toss in a few sets of bis/tris at the end of the workout, but they should not be the focus of your training. Squats, front squats, deadlifts, chins, rows, olympic lifts, flat, incline, and overhead presses should be your primary concern. Keep a constant set/rep range and try to get good at the lifts. Don't forget your ab work either.