Rotator cuffs - take some sort of weight ie can of beans, with your arm out straight to the side, raise and relax keeping it straight. Do the same straight in front as well. Gradually build up weight if wanted, but for bowling you want endurance/strength rather than size. Otherwise standard gym work on your arms/back/shoulders should help with bat and ball.
Core - planking, sit ups, side-planks, burpies. Make sure you work on back muscles as well so you don't become hunched.
Agility - ladders, or set up a tight slalom with cones. Maybe try the NFL style tests from the combines to improve agility. Also for endurance for bowling/fielding box jumps, squats (preferably with a kettle bell/weight) on one or two legs, and calf raises on a stair.
You can probably get a more expert opinion than myself online though, but I hope this helps. Most of my experience is from speed and agility based S&C training for frisbee/GB juniors training regimes, but I think it should translate across.