Stories are one of the hardest parts of writing comedy. For a start, they’ve all been done (one of the funniest episodes of South Park was called ‘The Simpsons Already Did It’, and was all about the difficulty of coming up with new ideas for an animated sitcom when… you get the picture). What your stories are completely depends on what kind of show you want to write: you can be minimalist and trivial, you can be emotional and wrought, you can be farcical and light… just be consistent, remember you’re trying to create a world, and don’t take the mickey out of your show (other people will do that for you) unless you really have to.