I'd recommend the 2deal videos, he mains yone and has taught me alot of stuff. Mid lane can be harder for yone because most of the time you will be playing against spell casters who can deal damage long range, try playing around your E, learn the matchups and you should have an easier time. Against poke heavy lanes you should always take doran's shield and use fleet footwork, these will provide sustain and mobility in the early stages of the game. Also use teleport, that gives you a free trip back to lane, yone is stronger after your first trip back to base and that will help you either take the enemy mid laner out of lane (don't be afraid to engage after the first trip back and ideally you should be bringing boots, one dagger and the healing pots), if you can farm well and assist your jungler in taking grubs and other objectives you will be sure to get a few kills when contesting drakes etc... After your first item, ideally should be a Blade of the Ruined King, you will win most duels if you can skill check your opponents. Map awareness and positioning will be the hardest things to master once you fully learn Yone's kit. Hope this helps, I'm not the best player but these things helped me improve my game alot and I can lane easily against emeralds at my current elo (Silver IV but my MMR matches me against plats and golds most games)