Follow it further along and you'll find an elevator, which will take you down to New Londo Ruins.

Pass her and find a narrow walkway downwards. To use the Firelink Shrine route, head to the bonfire and then head down to the left where the Fire Keeper is. You will need the Master Key to access this route, so if you didn't choose this item at the start of the game head instead down into the Depths and return to the locked gate (located near to where you fought the Gaping Dragon boss). The third way is by far the easiest, and will require you to start out at Firelink Shrine. The second is through the Valley of the Drakes, but the monsters there are extremely powerful and it is not recommended you go there at this point. The first is through The Depths, where you found a merchant in front of a large gate. There are three routes to get to Blightown. The best way to get a healthy amount of these for nothing is to farm Demonic Foliage in Darkroot Garden. You should also bring Toxic healing herbs, which is an even more potent version of poison. You'll want to bring a LOT of Purple Moss Clump.

Dark souls remastered power within