Hey Paul -
Have you shot your Glock 19? Have you ever shot a handgun?
When you say "convenient to my area", what does that mean? Are there firing ranges which are not convenient? If so, what inconvenience does that involve?
I think if your goal is to shoot an Airsoft pistol accurately, you are on the right track. But no, I don't think shooting an airsoft pistol equates to what you will feel with a real Glock 19, no. While it might be fun, ultimately it would be a waste of time. What you can do with an Airsoft replica (assuming it is a replica Airsoft Glock 19) is to safely perform basic manipulation - handling, holstering, grip, and presentation. Without live ammo though? No.
I think it's great you are trying to learn to shoot your Glock 19 accurately. Many people have used their pistols for justified self-defense without much training, at all. But it would be much, much better for you if when you do that, it's not the first time you've shot your gun.
Good luck and I look forward to your responses in the thread.