Greetings!
First of all , this is NOT an actual build ,if you really use this build , expect accusations for trolling, so better don't play ap Ashe on ranked. This build isn't just a brainless guide to troll , it DOES actually work. The key of Ashe is always her slows , so better use it in combination with this build's movementspeed to kite even better.

In the early game you should rely on ashe's aa ,so you better get the ad items first, since ashe only has her ult ,which requires ap for damage.

About mid game you probably can't trade so well anymore against your laner , the items getting rushed are only for cdr , so you will deal hardly any damage. Ask for help from jungler or from other lanes , so you can successfully reach the late game.

So now you probably finished your Lich Bane , which means using your w and after that aa will deal much damage in succession.