Hello, at my college we have barley touched upon the interactionist view so I don't think you need to worry about that, postmodernists you need to know a little bit of detail for it not as much as you need to know for fems or functionalists but I would recommend u learn the overall theory eg they like family diversity and a sociologist that is a postmodernist such as beck or giddens. These are always really good to put as conclusions if you get an essay on the conflict or consensus question. Hope this has helped!