Early game you want to start out with Doran's blades for for the early game advantage, because anyone who plays Ashe should know that she is weak until you get a B.F sword, having the three Doran's blades allows you to have +30 damage, 300 extra health and 9% life steal. So while your farming for your B.F Sword/Infinity Edge, you will have better health/damage then a normal Ashe would would buy either boots/pots or just 1 Doran's. Black Cleaver for the armor pen (is a must)!!!! and the Banshee's veil for the health/mana and comes in handy against karthus ult and Twisted fates ult as well.....and the Fervor is optional, picked it because of less cost and i doubt you will be able to build a Bloodthirster by this late into the game. Hope the guide does you well!!