I'd recommend going to the youtube Channels Rotor Riot and UAV Futures (and possibly Mr. Steele) if you want to get a nice series of well-sourced introductory materials by veteran professional drone operators.

I'm by far an amateur, and don't really have enough sim hours to fly the drone I'm just about done assembling.

But: the aerial camera gimbal is by far the hardest part to get right, and why vendors like DJI charge what they charge. Software exists to make it work, though.