http://www.demons-souls.com/wiki/
I have found different explanations for defeating certain bosses and other stuff, so you may need to search around in order to find what works for you or your character build. Also IGN's walkthrough is fairly spartan, but it can help as well.
An important thing to understand is World Tendency and Character Tendency. Certain major demons will only appear if WT is completely black or completely white. Also CT will dictate things as well. But you can still beat the main game without triggering all of the events.
In Demon's Souls don't get too caught up in leveling up, as you progress souls will become more abundant. It is more important to upgrade your weapons correctly. In order to do that effectively you need to learn about the Crystal Lizards.
If you need places to farm, let me know.
Easily the deepest most complex game ever released to console.
I think this is my game of the year.
