Like the others have said, start by taking a basic pistol course and learning the fundamentals. And of course, go to the range to practice.
But another big thing that's often overlooked is doing dry-fire practice at home. Make sure your particular gun is safe for dry-firing (many modern ones are) and possibly get some snap-caps (dummy cartridges with a spring-loaded back). Practice dry-firing 30-40 shots at least once a week. This has helped improve my shooting a lot.
The reason being is that most of what makes up a good shot is trigger control. Dry-firing lets you focus on the single most important aspect of pistol shooting, for free or almost free.
But another big thing that's often overlooked is doing dry-fire practice at home. Make sure your particular gun is safe for dry-firing (many modern ones are) and possibly get some snap-caps (dummy cartridges with a spring-loaded back). Practice dry-firing 30-40 shots at least once a week. This has helped improve my shooting a lot.
The reason being is that most of what makes up a good shot is trigger control. Dry-firing lets you focus on the single most important aspect of pistol shooting, for free or almost free.