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That's a really good start! Novel-wise, if you are interested in the background of the Imperium and the space marines, you can't go wrong with the Horus Heresy. It's a very long series but the opening trilogy is a phenomenal read: Horus Rising, False Gods, and Galaxy in Flames.
If you'd rather have a more down to earth story with a real human perspective, I recommend the Ciaphas Cain series (starting with For the Emperor), or the Gaunt's Ghost series (starting with First and Only).
If you like Black Templars then **absolutely** check out Helsreach by ADB.
As far as video games go there's a billion of them but not a lot worth writing home about. You've played two of the better ones. I always recommend the first Dawn of War (Dawn of War, Winter Assault, and Dark Crusade expansions). You can get by with *just* Dark Crusade, the campaign peaks in that one. Dawn of War replicates the scale and pacing of a tabletop game of Warhammer to an astonishing degree. It is packed with so many brilliant unit voiceovers too. Those alone make it worth playing for me.
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