Angels and Demons and Devils Oh My!

My church has asked to do a Sunday School series about Angels and Demons. I have to be honest this isn’t a subject that particularly interests me, but they wanted to do it so here it goes. Does anybody know of some good resources on the issue, or maybe have a good idea on how to approach the topic(s)? The majority of angel/demon language appears in the Gospels (mostly Luke) but then there is the principalities/powers language in the Pauline literature and I’m debating how to deal with that mostly because I still have a lot of questions myself. Anyway, I’m wondering if anyone has some advice or help?