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This will take a couple of steps to accomplish and it will lead to a life change if done correctly.
You should get your wife involved with this. If the person is seeking revenge, your wife could also be the target. Go to a well stocked gun shop and take a course with the NRA or involve yourself with a gun club that has IDPA matches. I wouldn't buy anything at the moment, but if events are critical right now, buy a .357 magnum with a four inch barrel and a 12 gauge shotgun with a 18 inch barrel from reputable companies.

If you have a month or so before things get dicey, go through the course with the understanding that the first gun may not be the one you're going to be really comfortable with. When you take the course, you not only have to learn to shoot but you will also have to learn to carry the gun and how to take it out quickly. Let me repeat that. If you're trying to learn to use a gun in an emergency away from the house, the course you take should include drawing the weapon. You're not taking a hunter safety course. If you can't find such a course, find a IDPA club and go to their competitions. They can help you with all of your questions.

My choice of guns is a small .45 auto from Springfield Armory, Colt or Kimber. For the beginner, a small .357 from Smith and Wesson or Taurus.
Shotguns are Mossberg 500 or 590 or a Remington 870.

Don't forget protection when you first start to train. Do not forget quality ear protection and glasses. Nothing stops the first signs of flinching than not hearing the gunshot. Wear a brimmed hat and shooting gloves are available from a company called PAST.

Ignore the poster that says anything about chambering a round in the shotgun will scare the guy.