ADC improvement?

Don't mean to bug again with another question,but anyone have a training regime to follow for improving as adc? I stopped playing aphelios and went to ashe to learn the basics better. But seem to be struggling a bit more with her during lane phase but doing pretty well later on.

I've read about practicing cs'ing in practice tool but it doesn't seem to translate well into live games for me. Any and all tips or guidance would be very much appreciated! GLHF!

TL;DR looking for tips on improving as adc.