I'm working on a production (most likely a web comic or animated web series) and I'm having trouble coming up with issue/episode ideas. I have the main characters mostly worked out and a rough idea of the kind of series I'm making. I have four characters, each with a specific, mostly non-overlapping skill set. Each instalment they use their skills to fulfil their contract. Problem is that I'm having trouble figuring out what kind of missions/contracts/stories they will be involved in. I figure the best way to start figuring things out is to write an outline of each character and their skills and build up the stories around that. Kind of like how a pearl is formed. Trying to find the central point around which the build each story is where I'm stuck. What are the best ways to layout the known story elements that is conducive to building a plot?