Hi all. I'm about to take my first crack at GMing anything other than a pre-canned D&D campaign tonight (and even that was 10 years ago). Obviously I'm choosing to do Apocalypse World, and I had a quick rules question.

I can see lots of reasons (especially given what the guys I'll be playing with will likely dream up) why some horrible post-apocalyptic monsters might come up as a threat, at least a side one that gets in the way as they try to accomplish other things. However, the rulebook never really goes into how you should treat monsters as a threat. Has anyone come up with a good rule of thumb for how to bring monsters/creatures into play?

Thanks in advance for any advice!