Dragonman's will be your least expensive range option, by far.
While becoming thoroughly familiar with your firearm is important, Youtube is NOT where you want to find this information. Instead, read your firearms owner's manual. If you still have any questions, see a certified firearms dealer, preferably the one from who you purchased the firearm.
While this too is good advice, how much and what type of practice you should be doing is more important than practicing "a lot." Practicing bad habits is not good. It's far better to learn good habits, first, then practice those. If you already know how to shoot both rapidly and accurately under a high-pressure situation, by all means, keep doing what you're doing. If not, I suggest either a beginner, intermediate, or advanced self-defense handgun course, depending on your current level of expertise.