Well what are your plans for mma? You want to get into it? Or do you actually want to have some sanctioned fights for money?
If you just want to do it for sport, fun and fitness then pick a weight you want to be at. If I had to fight professionally i'd definitely fight at 155. But I walk around just over 170lbs. If you want to fight seriously then you should probably focus on staying close to 135lbs.
For food you need to eat a balance of things, lots of protein 1-1.5g per lbs of body weight you have. But more importantly you need to eat clean. And by that I mean: no junk food, no fast food, nothing with saturated fat, no soda/beer. You should be eating lots of lean chicken breasts, fruits, vegetables. But dont be afraid to eat richer meats, cheese or milk, because you want to gain some healthy weight. I'd also suggest picking up some protein shakes from GNC.
For cardio you need running, sprints etc. 30-45minutes of cardio that you feel comfortable in 3-5times a week, slowly increasing in difficulty.
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