we just finished a campaign, and we'll start a new campaign from level 1 because my friends usually do background for their characters, explaining that are known or because they are trained in that class. and I would like to take their stories and their lessons for missions related to them. for example one is an alchemist, taught by his teacher and father, who has since died. and I thought of you find some notes from his father talking about creating an ancient and legendary alchemical object only done it once, and as respect for his father decides to create it. and because from there it slowly along the main campaign is discovering things about that object, and things need to create it.
Could you tell me any supplement, book or manual that get ideas like that. or also Could you give me some idea?
in the group are human alchemist, magus elf, summoner tiefling, cleric human, human Japanese ninja, fighter human.
Clerics can get holy missions from their church while ninjas belonged to a house and revived their orders from them. It depends one the game you are running and what their class is. If the magus goes for the black blade archetype you can get fun missions while learning about the history/origin of the blade. The summoner could get info throuhgh the eidolen. I would need more info for more details.
In my home brew game one guy wanted to be an assassin so I made a guild dedicated to fighting against the main baddy. I have a wizard whose family was kidnapped by the baddies. And the sorcerer was adopted by a paladin she is dedicated to battling the big baddies. Half my party's backstory is tied go the bad guys and the seem to like it.
Ultimate Campaign has some story feats listed that give a character a hook, a bonus relating to that hook, and a reward for completing a goal. The story feats are designed to be specific enough to make sense, but can be flavored to suit your needs.