If you're still hesitantly considering dipping your toe into the massive, mighty intimidating Dark Souls, consider first watching this video from the folks at "Lore in a Minute", which will get you at least a little up to speed on the goings on in the world.
Yes, there is a lot more to Dark Souls lore than they were able to cram into this 60-second crash course. In fact, as much as I enjoy these videos, I'd almost like to see a more spoiler-y, more in-depth sequel for some of these games. "Lore in Five Minutes?" Think of how much lore (and Adventure Time references) could fit in five minutes!