For recreation and practice any of the FMJ ammo in a brass case that you can buy at Walmart or other big box stores work fine.
For SD rounds any of the premium ammo does a good job and makes little difference which one you get be it standard or +P. Bullet weight is a matter of personal preference. Any of the police surplus ammo that was previously mentioned in JHP will be good too. Some of the better rounds are Speer Gold Dots, Remington Golden Sabers, Winchester PDX1, Federal Hydra Shok.
Note that +P+ ammo will void your waranty and is harder on your gun so its mainly for carry and shooting a little to see that it works in your gun reliably if you decide to use it. I do carry +P+ in some of my 9's and accept the risks of using it. You will find +P+ ammo from police and law enforcement surplus sourcesm, most brick and mortar commercial outlets will not sell it.