Yorick is a mid and lategame champ.
At the beginning u need to farm a lot.

He has a terrible mana and hp reg, but it's ok. If it's necessary buy pots.
But if he have some kills, he is really strong and fun to play!

Greater Mark of Desolation = good armor in the early game, and later
Greater Glyph of Warding = good magic resistance in the early game and later
Greater Seal of Replenishment = a bit mana reg, good if u are solo on top/mid
Greater Quintessence of Fortitude = hp
Greater Quintessence of Resilience = armor

1. Dorans blade -> boots -> long sword -> ruby cristal -> phage -> boots(armor, magic resistance,boots of swiftness)-> long sword -> cloth armor -> madred's razor -> frozet mallet -> vampiric scepter -> wriggle's lantern -> pickaxe -> B.F sword -> cloak of agillity -> infinity edge -> the black cleaver

Core build:
-Frozet Mallet
-Wriggle's lantern
-Infinity edge
-The black cleaver


Must haves:
-Frozet Mallet
-Wriggle's lantern

*The bloodhirster isn't necesarry cause u have life steal of your ghoul and wriggles lantern, thats enough. But if you want to buy it, it's not wrong ;)

Other possibilities:
-Manamune
-Atma's Impaler
-Phantom Dancer

Adapt the items a bit to the opponent!

Get ur E skill first, if you are on the top/mid, cause of the lifesteal.
The W skill is perfect for escaping, cause u can slow all champions in the range.

Use ur ulti like shaco's ulti or use it like tryndamere's ulti.(but u die after a few seconds)

Flash is my favorite.
Ignite is great if they want to escape and u dont have enough mana for another skill.

But pick whatever you like!

-Use e on champs for lifesteal
-Use w to slow them, so your team can get them
-Use q for damage. It gives u + runspeed, so you can perhaps get a champ and slow them.

Little introduce:
1. Slow them with w, so u and your teammates can get them
2: Use e for making dmg and get hp
3. Spam everything what you've got and kill them with ur teammates.

Pretty easy^^

Yorick is a great jungle champ, cause of his ghouls and good damage/lifestal. Use the all skills together (without ulti), so it's really easy.

Try to get always the last hit for faming gold!