Reloading: I'm a new M&P 9 owner (since I live in a free state I can pack it every day) but 40 years reloading experience.

Dies I recommend from RCBS or Redding. Get a 4-die set, i.e. buy two seating/crimping dies. First die sizes and decaps. Second die expands and flares. Adjust the third die so it seats only. Adjust the fourth die so it taper-crimps only.