You want to look for 9x19, Luger, Parabellum, 9mm - all the same stuff. There are, however, many makers and many types of 9mm ammo. For the range, you'll want "TARGET" ammo as it is MUCH LESS expensive than PERSONAL DEFENSE ammo that can be very expensive. The TARGET ammo is normally "FMJ" or Full Metal Jacket, whereas the personal defense ammo is normally "JHP" or Jacketed Hollow Point. All this 9mm ammo also comes in different weights - at this point I wouldn't worry about that. Just try and find the cheapest TARGET 9mm ammo you can find - the Beretta is well known for digesting any ammo you put in it.
Good luck and happy shooting!