Pretty much what Danzig said.
For ammo, the more popular offerings are HST, Gold Dot, and Ranger T. I like the Ranger without the T, and Bonded Golden Saber +P. All work well in the 124 grain weight. Some folks prefer 147 grain, and I like the 147 grain Ranger. At this point in history, take any of these you can find as long as the pistol likes it.
The good part is Glocks will run just about anything, and for range fodder, that is great.