What Rules/Rulebooks should I have for my army?
I've been playing 40K for some time, but recently acquired the Old World (re)Launch Box Tomb Kings Edition and have a friend who is also just starting Old World and we're excited to get going. The problem is that, from my understanding, the core rulebook contained in this box set is now no longer current.
Where is the best way to find the most current rules for both the core game as well as my Tomb Kings army? Secondly, I understand there's a "Combat Patrol"-sized version of the game called Battle March and we'd like to be able to start with the rules for that.
The best online rules resources are great, but I'm also not afraid of getting the official physical copies of whichever books I need (and frankly I enjoy collecting them) but I want to make sure I get the current, correct ones. Thank you.