Wait, you put the soul sign in 4-2 and got summoned and defeated the False King? You went between worlds as a Blue Phantom helper? How did you do that? O.O
@marciosmg
It's for free, since you only need to use the Doll's Soul and not pay him extra souls as will happen when you upgrade certain weapons at Blacksmith Ed, in there you'll need the demon's souls and extra souls for him to upgrade ;)
Well, I would exchange the Soul for Warding, it's the single best defensive spell in the game, and it will help you a lot in most boss fights ;)
As for the other souls, you'll need to plan accordingly to what spells/weapons you want to have in your first playthrough, since some souls have 4 different uses, that's why to get the Platinum trophy, people have to play this game at least 4 times.
Here's the list of the demon's souls and their usage, it can help you plan properly ;)
http://demonssouls.wikidot.com/bosses
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