welcome, try to get age verified, it's quite easy here in montreal
ok, so I have a glock 26, which is quite close -
I would advise you not to upgrade anything on this pistol unless it has a problem.
The barrel is really short and you wont achieve great velocity nor great accuracy, even after upgrade, BUT it's sufficient for close quarters, provided you tune the hop-up properly.
some crazy guy by the name of Mike McNair will try to get you to do things to this pistol that are against God's will and Nature.Do not listen to him