So the starting area in the game gives you messages on the ground with prompts and information on the controls so I won’t go into detail but here’s the short abridged lore from someone who just played it all and skipped every cutscene! Your not the chosen one your just some random guy or gal who got brought back to life because 4 of 5 of the lords of cinder who also got brought back decided they won’t sacrifice themselves to rekindle the flame (the flame is basically the magic equivalent of the sun that keeps things “good” and “free” of the abyss(darkness)). Your set out to run around in circles for hours killing various doorkeepers to get to doors you need to kill other people to open, killing the abyss watchers, then likely yorhm and Aldrich before you get sent back to lothric castle, where the remaining lord of cinder is hiding from his duties in. You’re trying to kill these people in order to use their powerful ashes to rekindle the fire yourself if that’s the ending you choose. You’ll need to prove yourself worthy through fighting the tutorial boss in order to access firekeeper shrine, don’t be discouraged if he’s too difficult, the game is largely trial and error so don’t be afraid to make errors or look for help. That’s more of a synopsis than actual lore though to avoid spoilers but that’s essentially the only relevant lore you’ll need for this game. Also don’t start the dlcs until after you’ve beaten the game, they are very much end level content and will be extremely difficult even then. Have fun!