This guide are for farm-gods in lane. This build's items cost alot so you will need to have an extremely aggressive support such as: Taric, Leona, Nami. You can also have passive supports such as: Soraka or Janna.

Use the Mark and Quint of Attack Damage because it allows you to do lots of damage early game. I use the Seal of Armour because it protects you from minion damage and of course, the other AD carry. I also use the Glyph of Magic Resist because it helps you if you get ganked by the enemy Mid laner.

I go 21-9-0 because you need all the damage you can get early game. I put 9 in the defense tree because you need the extra health and armor.

I go barrier and flash because barrier really helps to bait out your opponents; you might be very low on health and they might think that they can kill you, but surprise surprise, you pop barrier and turn back on them. Flash helps because you might have used quickdraw to go into a teamfight but you loose it and you're running away; you use flash to get over the wall.
You can use ignite if you want to, I recommend only using it if you are going for a kill-lane (kill more than farm).