ragdoll wroteHaving the Steam version won't put a damper on mods, right?
No it won't, Shogun 2 is one of the most mod-supported games on Steam, I do recommend installing Vastator's Unit Style 1.3 from TWCenter as you can't use the Workshop version in multiplayer battles, whereas you can with the TWCenter version. And don't forget to join/subscribe to TWCenter, TW forums and r/totalwar if you need help with anything, the TW community is very friendly.