I like to play talon and renek etc as skill based meele caster This focus's less on auto attacks and more on dealing alot of damage with a single skill this allows harrasment to be easyer and also scears people into running away allowing cooldowns to reset and let you mop up the kill

Runes can range to completely what you like however i find reds and quits have to be armor penetration otherwise you will loose 10% ish of your damage! blue i use cooldown because i cant afford any other runes but i like them because i use them on all champions
yellows is armor / magic resist / dodge because i like suriviablity its the only thing i use.

Simple as 21/0/9 i want the exhust because its damage reduction allows cooldowns to get there closer. And for the 5% more damage bonus.. you have alot of aoe effects that deal alot of damage

I choose these items because You want to deal + damage on skills and it can only be done with attack damage you get most out of a fully stacked blood thirster and the last whisper is the bonus armor penetration because it just dramaticlly increases damage then another blood thirster
you can perchase in any order which helps you.

Mobilty or swiftness boots is also viable i choose berserker at the start to help last hit minions.. 15% cooldown boots can be good to i just realise that i want to try it :)

your gonna be squisy so harrasment with w is essitental. get that first
then focus on q because hey more damage
e is like a teleport dash for bonus single target much viable with q and finally r everytime it pops up :D

Again this is completely viable but rally is deifiently a no no. why? because your gonna be dancing all over the place and not huddled around it. sorry.
I love cripple/exhust because it can make your oppents go full pelt on you dealing only a faction of the damage this also gives time for your spells to cooldown and slow your enamay :D

flash for thoes moments were 2.5 seconds of any direction running isnt good enouth

Having a r that deals 1000 aoe pysical damage is scary because they dont expect that much from a psycial carry this is great for decpetiveness! your q does more over time damage then most builds and your w is just a 700 damage aoe attack! on low cooldown great for harrasing there hole team!

Pros!
Great aoe damage
Harrasment is immense so no need to fully commit
Stealth for that 2.5 second bonus cooldown moment. and for fleeing chasing etc
Scear them with your ninjaness
Slow on your awesome w skill

Cons.
Expensive items means paintence you cant dwindle from the build or be underfed from a unlucky start.
One hit by cc and yourrrr out :D

Your aim is to go BOO.

Jump in with e on the squisy champions w them then q them when everyone is ready to cc you quickly r and flee causing immense aoe damage and escaping easily flash isthere to help cleanup kills etc.

You can easily farm by using the w spell which unleashes blades to do x2 damage psyical to minios or you can go ganking and havest their blood :3 either way is fun but more cash on champions maybe :)