I wast taught to focus more on weight shift, than anything else. As others have said, get comfy with manuals, then endos, then link them. Flats really help, as otherwise you may find yourself doing a 'donkey kick' to lift the back end, when it is more of a toes-pointed scoop.
Another thing I was shown, which I found a really useful, was to practice was doing lots and lots of mini-hops on flat ground, almost at a standstill. This just helps you get the rhythm right, as you weight shift backwards (front wheel rises), rapid weight shift forward and up (back wheel rises), front wheel lands, back wheel lands.