You might get some better and more informed responses at https://forums.oculus.com/ . The wizards there know a ton about good gear 
I’ve used AE for 360 video. It can be a pain to figure out, but it can be very fun when it clicks for you. Skybox has some good solutions for 360.
I’ve used Ricoh Theta cameras in the past for 360 video. What sort of footage are you looking to shoot? There are a lot of things to keep in mind when shooting 360 video to prevent the viewer from becoming nauseous. For example, unanticipated movement is a big vomit factor.
When it comes to headsets, you’re just looking for something to view the video with - not track the user’s head motion. Have you considered going with Gear VR or Google Cardboard? That seems like a much cheaper / more lightweight solution.
Lastly, drones bring up the issue of nausea as well. You might need to get creative with how you rig your drone. If you get a Ricoh Theta, a small drone would easily be able to support the weight.
Again, I’d ask this in the Oculus forum. This really doesn’t have anything at all to do with Unreal Engine.
Good luck, and I hope to see some of your work when you get started!