@_@ If you go back to the same room u will die the same way

You need to get to the crystal cave 1st then u will know what to do.

find a room with a ladder going down and an archer bowing u. i dont remember what floor but u need to use the rotate stairs to get there

Easy fight, two hand your weapon since you're not gonna be blocking anything. Strafe to sides, when she lifts her hand to swing roll backwards, she will also raise her sword but a longer animation to thrust the sword forward, this move has a high tracking rate, which means it will follow you to an extent so keep your distance. Her lava spit is when you attack, after the lava spit and after taking a few hits, she will use an explosive move, something like Wrath of God so keep back cos it might one hit you. That's about it really. And don't touch the lava so bring her to a more open area where you can easily dodge.

After talking to the princess go to Firelink shrine and talk to Kingseeker Frampt. You need to kill Seath, Nito, Four Kings and Bed of Chaos.