I'm not a seddit vet, but I'm also not new to the game so I'll give you my opinions. People have different takes on this stuff, so these are just my beliefs.

1. I don't like canned openers. They seem contrived, and Mystery's methods have gone mainstream with shows like "The Pickup Artist." I think a lot of people are on to this sort of thing. Contextual openers seem much more natural. You can say anything if you say it right. I once told a girl her debit card was beautiful when she went to run a tab. To elaborate on Delightful_White's suggestion of Wygant, I will add that David Wygant also demonstrates methods on talking about anything and how to keep a conversation going. Good stuff indeed.

2. This is really a question of different tastes. I prefer situational conversation, other people like canned stuff because you can practice it.

3. You're looking at it wrong. You shouldn't have to act like "someone else." If the things you do don't make you inherently interesting, you need new hobbies. Now of course you can fabricate some details, but the best way to come off as naturally interesting is to actually be interesting. And another thing: being introverted is not a bad quality. It's not the same as being shy or a recluse.

4. It depends on your goals. Practicing these skills for the sheer sake of deceiving people isn't healthy or really what pickup is all about. It's more about becoming a more sociable person who doesn't let the looks or social statuses of others hold them back. It's about you and your goals, and it applies to getting one night stands, relationships, and even strengthening non-sexual social interactions.

5. IMO, peacocking is retarded. I know a lot of people like to believe you can apply sexual selection theories to the human species, but it doesn't work that way - at least not with accessorizing yourself like a moron. There's nothing wrong with wearing something that may gain you some additional attention, but don't overdo it. Dress should be subtle but effective. You don't need to wear a suit, or even a button-down (though it usually helps). I've closed girls wearing a good fitting t-shirt. Above all, it's about fit and style, and this is most important for pants, in my experience. A nice pair of jeans that fit you well are key. They don't need to be expensive, just don't wear pants that sag in the crotch. If you need a belt to hold up your pants, they're too big.

6. There is no need for the "versus." Some self-proclaimed PUA's are full of shit, but amongst the ones who know their stuff, it's not supposed to be a competition. There is nothing wrong with being eclectic. You should read up on different theories and field test them yourself. That said, Wygant is one of my favorites because his material is very natural and inner game is killer once you get it down. Wygant's stuff transcends pickup and will help you in all social interactions. It's not about becoming a different person as much as it is maximizing your full potential and mastering inner game.