Breetai,
I thought you were in Kamloops for some reason. You're in Cowtown? Well, I spent eight years in Deadmanton so I can't ridicule you too much. I was there for my BSc (nice segue to answering your questions, huh?) and then left to spend a while in Toronto before giving up on the career thing and come to Vancouver. I'm currently working as a computer consultant for IBM, and I am writing for a technical magazine on the side.
I've never been much of a theist, but my family has some pastors and some very faithful people, so I'm expected to join in. To make them happy. I have read a lot of Christian apologetics, and to balance things out, I've read a lot of independant histories and comparative mythology. But for all of that, I'm only 29 and still learning. (Not that I want that to ever stop learning.) Evidence has always been a barrier for me, so I have sought out as many books as I could which would deal directly with the historical evidence of the bible.
As for dates of when the biblical texts were written, find out why your sources have given the dates they have. In the second century there was a reference to "scripture", but no indication that this was anything resembling the current books, and the author hadn't even seen the scripture and was reporting on a rumour. The first biblical text is dated to the third century, AFAIR! Beyond that is just inference.
Current dates are in the 35-150 year range, depending on the book and whom you ask. These are determined by what events are described and what are not, reasoning that some events should have been included, and since they weren't, the book was probably written before it happened.
To make matters worse, we have no idea who actually wrote the NT books. We've given them names, but these are conventions and not a signature. Because of the inferred dates, and the fact that the books were written in languages the supposed authors couldn't speak, all we do know is that John, Matthew and Paul didn't write the books with their names.
There are other factors involved in the dating. The text "Q" and the body of knowledge "L" predate even the earliest of the synoptic gospels, so that pushes the dates of them back even further. And some books have much greater mythical content, implying a greater separation from any historical events.
Saying 10-15 years is unheard of, and 50 years is getting closer to the earliest accepted dates for the first biblical texts.