Sometimes I plot things out, but usually to start, I just start writing and see what happens. What the heck is a zombie omelet? I didn't know either, until I started writing The Zee Brothers!
My characters tend to banter like eighties super-heroes, a sign of my childhood influence of comic books.
I tend to look for humor even when writing on a serious subject. Did someone just lose their arm? Perhaps we can use it as a weapon on the next page or maybe we try and put it back on because one of the characters once played a doctor during sexy time roll play!
Yes, sometimes its absurd humor, but if it gets you laughing, then I've done my job!
My stories are often influenced by my real life events. The old axiom, "Write what you know" manifests to fill the pages.