Hi! It's my first build so I may make a mistake. Sorry for that :)
As you can see, I'm not a native speaker, but I think it's understandable.
I wanted you to choose your own items, I listed the core items, you'll decide the rest during the battle.

Harrier

Use this skill for poke in early game, don't let enemy's adc get the minions easily. Make them scare from your passive :)

If you choose to buy statikk shiv, try to use your passive with 100 stacks. It will make a great damage, but this tactic is hard to make during teamfights.

Blinding Assault

Another great skill. You can use it effectively against every adc. Blinds the target for 2 seconds, gives you chance to hit your enemy safely.

Also useful when you're almost dead, fighting against low healthed enemy: press q and watch him miss the attacks. This guarantees getting the kill.

Vault

You can use this to catch an enemy, but there's something you must be careful: IF ENEMY USES FLASH WHILE YOU FLY OVER THEM, YOU FLY TO WHERE ENEMY GOES. So they can pull you under turret. Try not to use it near enemy's turrets.

When you use Vault on an enemy, this triggers your passive on enemy. So we'll use this skill to make great combos like this:

Harrier

Blinding Assault

Autoattack

Vault

Autoattack

Or when you're escaping:

Blinding Assault

Vault

Autoattack

Berserker's Greaves For early attack speed
Blade of the Ruined King Good life steal, early attack damage and attack speed, unique active lets you hit running enemies and slows them or heals you when you're running.
Bloodthirster Grants huge life steal with BotRK. You won't even need defensive items. Just hit something and your health comes back.
Statikk Shiv Makes great damage with passive but hard to use.
Phantom Dancer Good critical hit and attack speed, also makes your ulti a great chasing/running skill.
Runaan's Hurricane Allows you make multiple attacks during TF. Good attack speed.
Last Whisper Necessary against tanks.
Warmog's Armor Huge health source, gives health reg. Allows you stay alive during TF.
Frozen Mallet I prefer warmog, but it can be useful against fast enemies like Akali Hecarim or Singed

Thanks for reading.