Dark Souls: Prepare To Die Edition Tips

Farming for Ore
Yes it is in fact possible to do something called farming in a video game. It's called killing the same type of enemy many times until it drops a certain item. Every enemy drops something different. Also, items are dropped more often depending on if you are human or not, and how many humanity you have ingested and are currently carrying around. The more the merrier. Here's a few good ones.

Undead Rats: Humanity
Undead Baby(Catacombs): Humanity
Leech: Green Titanite
Man-Eating Clam: Twinkling Titanite
Titanite Demon: Demon Titanite
Mimic: Symbol of Avarice