Hello summoners, this is my build with Yorick,The Gravedigger. He is based on Heal, Attack Damage, Attack Speed and Armor with less Magic Resistance.I chose this way to play because i don't like to buy HP,HP and again Hp with a champion with Average to Heal and Attack, so I chose HP+AD+AS.

Pros:
VERY GOOD PUSHER
Very usefull spell(view skill sequence)
Cool ultimate Omen of Death
SUMMON GHOUL
Cons:
Stay very easy without mana

I recommend to you that any Dps/Off-Tank(in this case)to rely on Quintessences and Marks.
So, my proposed runes:
Greater Mark of Desolation-I chose A Penetr. because Omen of War and Omen of Pestilence deal physical damage, but instead of A Penetr. can buy Greater Mark of Health
Greater Seal of Armor& Greater Glyph of Magic Resist-Yorick is an off-tank and is good to use armor and magic resist.
greater quintessence of desolation-is exactly the same as marks.
Order to buy runes- 3xQuintessences>9xMarks>9xSeal>9xGlyph

In terms of masteries, Yorick is the best on Defense.It remains much time in fight for deal much damage,so 21 talent's point for Defense.The other 9 point i put them it Offense for Cripple and Sunder .

Pun first your point to Omen of Pestilence.It help you to First Blood.
Omen of Pestilence is the most useful spell: deal area damage and slow so is first spell with 5 point.
Omen of Famine is second spell. have a big range and heals Yorick.
Omen of War is the last spell. Use this spell for SPEED.
Omen of Death What can i say?...use this ultimate for destroy turrets/inhibitors, for kill enemy, and for revive.
Warning!: Chronoshift can't be revive you after you have been revived by Omen of Death

Skill Combo:
Omen of Pestilence(for damage and slow)+ Omen of War(for damage and speed)+ Omen of Famine(he has the largest range) and Omen of Death(for revive, additional damage and fun).

I use Exhaust and Flash.they are best suited for Yorick.
Other useful summoner spell:
Teleport(only 5vs5)
Ghost-for SPEEEEEEED.
Heal& Clarity-for to stay more time on lane.
Ignite-I left at the last because he uses at last.

Spells not ever pick:
Clairvoyance
Smite
Rally
Fortify
Revive(you have Omen of Death)

Items are the most important in match.
Order in which you must buy item:
-buy Doran's Blade-is perfect for start,deal Hp and AD
-buy Boots-cost less and go fast on lane
-buy Tear of the Goddess-deal very much mana and M Reg.
-buy Berserker's Greaves-for AS.
-buy Phage-Hp and AD.
-buy Shen the item-amazing combo with Omen of War and mana.
-buy Frozen Mallet-much HP, less AD and slow.
-buy Zeal-AS,CC and Movement speed
-sell Doran's Blade
-buy B.F.Sword-AD,AD,AD
-sell Tear of the Goddessyou do not need much mana, so it's good to sell
-buy Heart of Gold-Gold per second and Hp
-buy Trinity Force-for many things:HP,AD,AS,CC,MANA,M.SPEED.
-buy Bloodthirster-live style, this item can deal to you +100 damage
-buy Guardian Angel-armor, M.rez, and Revive
-buy Randuin's Omen-Hp armor hp per sec

Yorick is a very good champion that worth buying.