Yeah exactly most is in there somewhere just to answer everything:
Yes i did everything myself (except the music, tried that for ep. 17, but it's just too much work).
The drone is the DJI Mavic 2 Pro, i use the smart controller from DJI.
For the "ground shots" i mostly use the Osmo Pocket, for Timelapses and longer stationary shots i use the GoPro 6 and preferrably the Osmo Action.
I also use a Zoom F1 for seperate audio recording, to get surrounding nature sounds. I don't always use it though.