Glocks are great guns. For best results on your first range trip, make sure to give it a quick cleaning and lubrication prior to firing it for the first time (check the instruction manual under "cleaning" for details).
The subcompact Glocks are fairly amazing; they shoot almost as well as the full-size models, and in some cases actually seem to kick/bounce less than the larger guns! I know I ran several defensive-style courses of fire back-to-back with a G26 and a G19, and more than once my time with the G26 was significantly better, with the same solid hits from both guns. They'll never be contenders in Bullseye target shooting or a handgun beauty contest, but the baby Glocks are hard to beat for their intended purpose.