Ok so I'm pretty new to comics. I've known about the basics (spiderman, superman, batman, x-men, Fantastic 4) for a while but I never really read the comics. So I was at B&B the other day and saw a Ultimate X-men Vol 1 and picked it up. It was pretty good and I liked the story, however I'm confused because now I wanted to order a few others but it seems the book I got had the first 6 stories in it and then another maybe "mini-series" called return to Weapon X it seems it was a collection of 1-12 not just the 1-6, 7-12 and so on books I find on Amazon.
Can someone please clarify to me what exactly it was that I got?