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You only need the main rulebook and the battle companies book. The battle companies book contains a large number of companies and scenarios. Well worth the money.
I appreciate the more concise run-down Coenus, can you give me a bit of an overview on BC compared to say, the aforementioned Mordheim? Is it possible to build a few smaller BCs and just have some fun one-off skirmish games with buddies? Is the rule-set fairly light for casual play?
TBH, I like the look and contents of the very first GW LotR box set for the Fellowship of the Ring. https://boardgamegeek.com/boardgame/3563/lord-rings-fellowship-ringTwo questions in it:1) are the rules in it still good enough or has almost two decades of refinement produced a cleaner rule set and I should still look for a more modern book. If so, which one?
2) how difficult would it be to add or subtract models to the scenarios to season the games a little?
Saga Age of Magic and Warlords of Erehwon are also worth considering.