Quite simply from hand to hand is the best place to start with this and not in a full bowling action at all. Just get your grip right then flick it from one hand to the other getting that seam rotating correctly. In time the rhythm and the strength will come as your wrist gets more educated. Forget variations too and concentrate on that leggie. I recommend going out and buying Peter Philpotts The Art Of Wrist Spin. It covers a lot of the basics extremely well. Learning leg spin is a very very long road. I started when I was 23 and now ten years later I'm still trying to crack it. It's a bit like golf, just when you think you've nailed it something goes wrong. You never stop learning. But it is a hell of a lot of fun, just expect some horror days! You'll have to have a thick skin and really love doing it. Have you consulted all the usual YouTube masterclasses?? Benaud, warne, Jenner etc...?