>>65371118>Where do I take my interest from here?
If your interest is more for the video games, Battlefleet Gothic Armada 1 and 2, Inquisitor - Martyr, Space Marine, Space Hulk - Deathwatch, Mechanicus are all good.
If you are more into the lore, you might as well start with the Dark Imperium, Devastation of Baal, War of Secrets and Plague Wars for the books relevant to 8th edition so far. And then work your way back by reading around major events like Domacles or the war for armageddon, or even Damnos.
If you are more interested in getting into the tabletop game, there are Start Collecting boxes for most factions, and there are 'starter sets' like Dark Imperium, Forgebane, Tooth and Claw, Shadowspear and the like that has 2 armies from different factions fighting against each other.