I can't figure out how to make the door open like it has hinges. As of right now my door just turns sideways. Someone explain how to do it please.

I have not played with rotation yet in b ops3.. however in WAW, I usually just Play around with the kvps until it looks right. Also rotation starts from the xmodels handle (origin) so keep that in mind if your rotation seems to happen on a strange angle / axis.

Actually, JBird632 makes a really useful tutorial on 3 different doors: Power doors, Debris and Buyable doors (which he made rotate when opening). The tutorial can be found here...