First off, the Glock 30 is NOT a 45mm pistol. There is no such thing. It is a .45ACP, which is a .45 caliber round.
Second, the .45ACP is not a cheap round to shoot and I would not recommend such a compact gun and such a large caliber for a new shooter.
I normally recommend a revolver for new shooters but if you would like a pistol, I suggest you look at the Glock 19. This pistol is chambered for the 9mm round and its magazines hold 15 rounds each. It is large enough to shoot well and small enough that it can be carried concealed.
Before you do anything, I would suggest you take the time to complete a basic handgun course.