I recommend taking a solid shooting course from respected instructor(s) to all gun owners, however, what you learn from the first class shows you 80% of the curriculum of nearly every other class. Much work can be done on your own for little cost, provided you have a brain and don’t need every piece of information spoon fed to you.
Consider Art of the Dynamic Handgun a class offered by Travis Haley and Chris Costa of Magpul Dynamics.