Training Attack Move?

I'm a jungler/support main, primarily because I'm pretty bad with last hitting. However, with the recent Devourer jungle item change, I switched over to Kayle and her ranged E splash attack is more or less turning me into an ADC when I'm getting into a team fight. I'm doing the laborious "click the enemy champion" in a team fight, and obviously, that's BAAAAD.

I've heard of the training regimen for last hitting, where you go into a practice match with no items or runes and see how many creeps you can last hit in a minute, but I can't find any good "orb walk" training. Sure, there are a few guides on Youtube from a few years ago, I've seen some weird "oh, just rebind your keys" from a few years ago as well, but I'm talking right now.

ALSO: I can't count the number of times I've held down shift to attack someone going into a bush and I auto attack a nearby minion instead of the champion that's running from me. I think I remember hearing a "Attack Champion Only" button or some such.

Anyway, I've played this game far, far too long without learning this skill, and Kayle is just showing me I need to learn it immediately or I'll be doomed to rot in Silver forever. :)

Thank you for all your help!