Always go for first level 2. Test your opponent will he push you away from the wave or will he let you auto the minions. Try not to Q the minions, but instead stack your Grasp and poke the opponent with grasp auto + Q combo. This will chunk nearly half the opponents healthbar. Remember to check if the enemy has Boneplating. If they have it, like most of the time try to break it before doing the combo.
If you managed to get lvl 2 atleast at the same time and you did a grasp +Q combo lvl 1 you may have lethal lvl 2 with e and another grasp Q combo. This way you will atleast get prio on lane and get first level 3. You always want to do short trades with your Q, only extend the fight when your opponent makes a huge mistake and the kill is garanteed.

You can look for crashing 3rd wave to cheater recall. Or you can try to bait the opponent to push the lane by playing slightly behind to get a W > E > Grasp > Q combo for lethal. You likely gain control over the lane atleas after buying sheen for increased bonk poke damage. Do not use W unless you are looking for a lethal or burning one or more of opponents summoners for this ability is the most expensive one.
Use your mana wiesely.

Continue short trades as before. Do not insta cast R when you level up. Instead enter all-in wiht E (with 4 graves)> W > R (after ghouls have jumped on target) > Grasp > Q. By doing this you can have double ghoul leap with a single E casnt and deal significantly more damage. Always look for a lethal when you level 6 or are about to level up, this way you can surprise the opponent by initiating a fight with well aimed E to both start the fight and gain a level up. When going for a lethal always remember to move ahead on the lane so yout opponent cant freely run away under turret.

Easy and clean dive. Let your opponent auto you first so he takes minion aggro. Then you continue your all-in normally. If you took ignite use it and run out of tower range between enemy towers. Your ghouls and Maiden will finish the kill for you. After kill you can safely enter under turret and get 1-2 plates before reset.

Always look for a first tower takedown. If you have not made mistakes you shoud already be top gapping the enemy opponent and have a free first tower.

At this point you should be about to finish your second item. This is the point when this build stars to work wonders. Look for aggressive plays in the enemy jungle to catch someome out of position. Deep ward and continue pushing the lane to take down 2nd tier tower. You can always look for a moment to take Herald or gank midlane resulting into dive and enemy tower falling.

Keep pushing lanes. Remember to play on the opposite side of the map where next objective is. Play towards top when drake is up and play towards bot when Baron is up. As Yorick you should continously apply pressure to sidelane to force enemy team into you. With this build they do not realize the amount of damage you can apply and by simply throwing E on enemy carries will likely kill them. The enemy team always has to send atleast 3 memebers to stop you from taking their base and ending the game. This leaves your team unchallenged elsewhere on the map for free baron and drakes.