Pretty much the standard start for any jungler in Season 3. It's cheap and efficient. You shouldn't need all of your potions while jungling, so if you think it's needed, feel free to replace one or two of the health potion with a mana potion.
Early Game Items:
Grab an early Spirit Stone and Boots of Speed for extra jungle sustain and ganking ability.
Yorick spams spells, and needs a lot of mana because of it. This is the perfect item for Yorick, it grants him more mana (and in turn, attack damage, from Manamune) as he uses his skills. Build into a Manamune later.
I can't say it enough in this guide: Sustainability! Yorick relies on sustainability to be a jungle farming monster, this item will help him do it. With some added Magic Resistance and Cooldown Reduction, it's a fantastic item on Jungle Yorick.
More often than not, this is what I'll end up building. The Magic Resist and reduced Crowd Control duration is too good to pass up. These might not be the best choice if the team is mostly Attack Damage.
Buy these for teams that rely heavily on Attack Damage and auto attacks, pretty straight forward.
Core Item Build:
This item builds from your Tear of the Goddess, and gives you the Attack Damage simply for spamming your spells. There's a reason most players build this item on Top Lane Yorick, it fits in so well with his skill set. It should keep your mana at a good level throughout the game. If you get any of the items mentioned in this guide, Manamune is the one to go for.
Great item for Yorick. With recent changes, it now adds Cooldown Reduction! This item is extremely cost efficient and makes you very tanky. The added damage to minions is always helpful, although to be honest, not terribly noticeable or needed. Don't rush this item if you think there are better items you need, however a solid pick in any game.
Armor, mana, and Cooldown Reduction. All of these things are Yorick's best friend. A solid item for any team.
Late Game Item Options:
I would say this is one of my favorite end game items for Yorick. As an off-tank, you'll want to soak up some damage, and the added armor will allow you to do it with ease. The passive on this item shuts down auto-attack based champions like AD Carries. Between an auto-attack based AD carry and many auto-attack based top and jungle champions, there's a good chance that this item will significantly cripple an enemy team.
Health isn't partial to damage types, magic or physical damage, it doesn't matter. Warmog's Armor gives you a huge health bonus that pairs really nicely with an Atma's Impaler. If you feel that the game may end soon, there might be a better item to build, as farming creeps and kills for the additional 350 health takes a while.
What can we do with all this health we have from a Warmog's Armor? Atma's Impaler of course! Get an offensive boost from all that health you have. Gives you a good amount of armor too.
This is a great late game item for teams that are heavily focused on Magic Damage. Get a nice shield when you drop too low in health, this item is a great mix of offense and defense.
Yorick is already annoying enough, his ultimate brings you back to life for a short period, why not add ANOTHER life into the mix? Great mixed defensive stat bonuses, plus a chance to be resurrected after you die.
A good all around item. Gives you some tanky stats, movement speed, and the passive from the Sheen makes spamming spells even more lucrative on Yorick. This item is very costly, however, and I would only recommend building this item if your team has enough tanks, and you need to do more of your team's damage.