Dude, like Tonytonetone said, the PU field is vast, and there are more resources out there on the internet than you can possibly hope to read. You don't need to pay for anything.
I will just say one thing though. As humans we all have animal instincts formed by evolution; we all have a lower, carnal mind that runs the body. And obviously one of the main drives of this carnal mind is for sex. The thing is, however, that this drive, this desire, is an insatiable one. The body, the carnal mind, can never get enough sex, which means that if you allow your animal instincts to rule your life you will place yourself on a slide that keeps dragging you down further and further.
There is nothing inherently wrong with sex, but if you have sex purely for gratification of instinct then there's the danger of putting yourself on that slide, where your carnal mind will keep demanding more and more, and it will make your life miserable if you don't get it. There is actually the danger that the carnal mind, your lower instincts, can overpower the conscious, human you.
So I guess what I'm trying to say is that you need to be sure of what you want in life - what you want out of PU. I get the feeling that you are doing this as a reactive response to your circumstances, and indeed, most PUAs did start out this way. We did it because we were terrible with women, because we couldn't get sex, because it was humiliating to feel like a failure with women, because we felt inferior compared to other men etc etc (I'm not sure if that's necessarily the case with you but that is the impression I'm getting). The danger with this is that you'll come to see PU as an end in itself; because if you actually do get good with women and actually reach the point where you are able to get sex and attention from women, then it can become a sort of addiction.
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