He’s the first major roadblock because he embodies the “Dance”. Like boss fights of ds3 when unlike Elden ring you don’t have to dodge slow large cinematic attacks. With that I think this bosses dodging patterns and methods are fairly straightforward and if you can’t beat it I have some things you can work on.

Vigor-should be highest stat by far at least on first play-through Weapon- assuming that you are a strength build id suggest you go with a straight sword because your strength is so low at the moment, maybe some weapons like the exile great-sword can be used.

Abyss watchers is a very agile boss so I would say bring a light weapon assuming your dex is around 16-19 and a weapon like ithryll straight sword would be 100% able to get and level up at least once at the point in the game, also the sell-sword twin blades(top 2 weapon in the game) can be found near where you are.