I'm a Krav Maga/CrossFit trainer for Ohio Krav Maga. We are opening a new gym right off polaris so that would be close to you, as well as the one we have in Gahanna. Free classes on Saturday the 30th if you want to come try. http://ohiokravmaga.com/OKM-LewCtrGrandOpen-web.pdf
For diet.. look up the paleo diet. Lean protein, nuts, berries, fruits and veggies. Or think about buying and eating only things on the outer loop of the grocery store(except for dairy). Stay away from all processed/boxed food.
As for working out.. Look up CrossFit. Stay away from isolation, just do compound movements. http://library.crossfit.com/free/pdf/CFJ-trial.pdf
The philosophy behind CrossFit:
Practice and train major lifts: Deadlift, clean,
squat, presses, C&J, and snatch. Similarly,
master the basics of gymnastics: pull-ups,
dips, rope climb, push-ups, sit-ups, presses to
handstand, pirouettes, flips, splits, and holds.
Bike, run, swim, row, etc, hard and fast.