You need to take the a2cofc course, or the GVC Depending what you want to fly and how close to people you want to fly. You also need to register as an operator and take the theory test, which even my wife passed with full marks and no drone knowledge whatsoever.
Both are fairly new and aren’t actually required until Jan next year. I’ve started the a2ofc training online. Seems pretty straightforward, just basic meteorological knowledge and common sense. I have an online classroom in October which covers the more in depth stuff and then an online exam after that. It’s multiple choice and you get free retests if you fail. Pass rate is 75% I think. There is currently no requirement for a practical flight test, you just have to self certify you can fly a drone and perform certain manoeuvres safely.
The stupid thing is, the courses are meant for c2 class drones, and none of those exist yet. Any drone currently available (Apart from the mini) will become a legacy drone and after 2023 will revert back to “fly far away from others”.
So either you wait until a c2 drone is available, which could be any time from now til who knows, or you just use what’s currently available until the rules change. My view is, I’d likely upgrade my drone in a year anyway, so I bought the Mavic air 2 and the Mavic 2 pro last month. They will last me until a c2 drone is released, by which time they will be old tech anyway.