Yeah PM stands for Private Message! I am clueless with a lot of the things people say on the net these days BRB, LOL, ROTFL, FML, etc. I usually just stare blankly at the screen. If you want to send a PM to someone you just click that persons User Name and it will take you to their profile, then you go to Contact info, and then send Private Message. Hope that helps.
As for books, Keeping Carpet Pythons by Simon Kortlang and Darren Green is a very good book to get, it’s only a small one so it doesn’t cost too much but has good info. I got mine from the Gully Reptile Centa. And then there is always Care of Australian Reptiles In Captivity by John Weigel. Both of these books you should find in a reptile shop, and the latter of the 2 you can sometimes find in book shops, I bought mine at Angus and Robertson. I’m always recommending these 2 books to people, but my personal favourite would have to be Keeping Carpet Pythons.