Training to own a firearm?
Ideally, one should seek training from a professional. Personally, it has always been an ambition of mine to attend Gunsite or Thunder Ranch. Outside of that, a local certified instructor is the next best option,
Books should be supplemental to any practical training received. The more information you can absorb, the better...as long as it is reliable information from a reputable source.
Instruction from very well meaning friends and/of relatives is often times filled with opinion and preferences of the acquaintance. When it comes to training with firearms for personal defense, opinions have no place. It is up to you, the trainee, to learn the facts, apply them to your needs and develop your own opinions.
Almost any reputable gun store should be able to refer you to a certified NRA instructor. That would be a good starting point.