New story idea

The hubby and I just watched Conan and I got a new story idea. Well, sort of. I know it will take place back in the middle ages but that's about it. No plot or anything. I already have to finish the novel I'm working on and edit another so I can send out more queries. Not sure what my plan of action is yet. I think I can begin research and make an outline. I can let the idea stew while working on the other things.