Start with doran's blade, focus on farming and go back when you can afford boots of mobility and mana crystal(wards if needed).Get sheen then complete your manamune.Complete trinity force and get Vampiric scepter, then build it to Bloodthirster.[This is your core item set]Other 2 items can be whatever is needed for the game, but in a perfect situation get Frozen mallet and Infinity edge.

Be sure to max E first as it is your greatest laneing tool.Be sure to upgrade Q and W when you can, because they are very important for a plausable escape or gang.Take ult when you can, feel free to use it to destroy the tower when the opponent is in their base.
If you fear that you are not expirienced enough take teleport instead of ignite,and if you are REALY scared take heal as second option.I find that ignite and flash are awesome on Yorick because they are great hunting and escape tools.

My choice for runes might be weird for you, but i find those runes quite universal for almost every ad character as it adds stats that are needed early in the game and give quite the advantage compared with full AD or full TANKY runepages.Especialy the +101 mana can be crucial for your early game sustain.
As for masteries i prefer taking every major offencive mastery (for AD ofcourse)or else, if you're feeling more like a tank, every major defensive mastery.

When you first start at top lane concentrate on creeping, after taking your boots and mana crystal you can both hur*** the enemy and creep.After your sheen you can switch to even more agressive style , but if you do so ensure that you have wards to protect you.When fighting the enemy top firstly cast W to slow him and then Q to speed yourself(don't worry if you can't catch up to him you can afford to use Q on creeps too) by this time the enemy will have made his moove, If he did attack you use E o heal up and there you've lost a bit of hp while the enemy has been devastated by your awesomeness.If the enemy is agressive enaugh you can use ulti after W and Q to increase your damage and finish him with E, even if you die your Q,W cooldowns will have reset and you can destroy him with your second live.(also ignite him when you ensure he will not escape.A great "trick" about your Q is that it is activated on next attack, wich means that you can autoattack then imidiately use q and your autoattack timer shall reset.

In teamfights ensure that you will not initiate especialy against a team with lots of cc and silences.What i do is wait for the tank or jungler to initiate (Lee sin plays those 2 parts realy well), then focus all of your power on the squishyest targets.What mostly happens is that you will kill the weakest (in hp but not in dmg) target before their team can switch to you and kill you.When you see that you are being focused imidiately ult yourself and continue to attack the next target (choose by squishyness).At the same time your team should have wiped out few of them or atleast a big chunk of their hp pools.In the ideal situation you will kill atleast 2 or 3 of them before you go down and leaving your team to deal with the enemy's tank and or offtank/s.I also like to do gangs on enemy red buff after teamfight (if it's there), you'll be surprised how often there is somebody to go and take it.Wait in the bush for the enemy to attack the lizard, then obliterate them both with your spells and run like hell before they gang you(this shouldn't be hard as most of the time the range ad carry will go red).

Feel free to comment if you find some major flaws (BUT AFTER YOU TEST THE BUILD-RECOMMENDED) and i shall respond to you
sorry if misspelled something i am not english.