It's such a shame this thread has never historically gotten more helpful responses. I am certain there are many members here who, if they knew this, would make themselves available with replies and support for those with so many unanswered questions.
Whether you've recently received a diagnosis for a type of NPD, or suspect there is a person close to you who has this disorder and has affected your life profoundly, and you are looking for more help with it all, please know that:
-These forums used to be hugely busy, and many people signed-up every day. There were many posters, and people came and went with a fair amount of frequency. Things are different now, and there are not as many users as there used to be---but the veterans who remain are largely very helpful (where they can be) and genuinely supportive folks.
-Please keep in mind that MOST people here are suffering from their own mental health issues, and could also be here seeking help with a situation of their own. They might not have many answers to offer, as NPD happens to be difficult to detect in so many instances; and it can also take a long time before someone realizes what they're actually dealing with.
-People's situations can be complex, they've been deeply affected by it all over time; and these things make it hard to discuss, as so much has happened in their lives. Please, if this ever picks-up again, remember to remain kind, and enlightened.
More help, here:
What Is Narcissism and What Causes It? Helpful info from Psych Central
There's a lot there...and there are links on that page you can follow to learn more.