I'll put on my NRA Instructor hat.
I'll leave the PRSI aspects of this to PRSI and the legal requirements and restrictions to your own due diligence.
First, find a
course from a qualified instructor. I recommend Basic Pistol and/or Basic Shotgun, Personal Protection in the Home, and if you have no prior experience (or just want to "reset" your knowledge base), the FIRST Steps courses as appropriate. Above all else, you MUST ingrain safe and competent handling and usage, or else you're more a danger to yourself and others than without a gun.
If you have doubts, consider less-than-lethal alternatives. I recommend the
Kimber JPX as an outstanding self-defense alternative.
Second, find a range in your area that you feel comfortable with, and it may not be the closest one. Do the staff treat you with concern and respect, or are you treated as "not one of us"? Do they have a good selection of pistols, rifles, and long guns for rental? (BTW, solo rentals/range time is not an issue anywhere I've been). Consider a membership if they're available, as it can be a tremendous long-term savings if you frequent the range often.
Handgun or shotgun? Only you can be the judge of that, but in the likely scenarios that would necessitate the true need for it, a handgun is preferable, tbh. From a tactical sense, there are more options on cover & concealment, lighting, and on & on.
If a handgun, pistol or revolver? While a revolver is more "foolproof" mechanically, a pistol may offer an advantage in capacity, rate of fire, general personal accuracy under stress, and other factors.
The bottom line is that the right gun is the one you are most comfortable with and can shoot the most reliably and consistently.
Listen to advice and suggestions, but view skeptically any that is presented as an "absolute" with regards to type, make, model, or even the fundamental choice of means of personal defense. These are all choices you have to make for yourself, and with full understanding of the consequences of those choices, morally, legally, and financially.
I've been a shooter for 35 years, with military, law enforcement, and civilian training and certifications, and have lost count of the number of firearms I've shot or qualified in. I've done tin-can time in the boonies all the way to national matches, and the one thing that has been consistent is that each time I've been under arms, I keep an awareness of what I've got in my hand (or on my hip). It's not something to be undertaken lightly, but it is also a tremendous sport and a skill that, once developed, is something that you can be extremely proud of accomplishing and further developing.
Good luck, and keep us posted! (BTW, pics of your qualifying target are always appropriate)
