You start of by taking Dorian's Blade which gives you some extra Health, some minor Damage, and Lifesteal. Make sure you don't waste your mana. You can use the Volley to damage an enemy champion without having to worry about the whole minion wave jumping on you. Most important be more defencive unless you see an opening to kill an enemy champion without dying in the process. Ashe can easly be killed so thats why I take summoner spells like Flash or Ghost which enable you to both run away and chase down an enemy champion. You can always switch one of them with Clairity if you want to. When you reach lvl 6 you can try to pick of enemy champions that are unaware of the fact youre a lvl 6, because I've rarely seen anyone warn about an enemy champion that does massive damage or teleport (Twisted fate, Ashe, Karthus etc.) or you can always use the ult on an enemy champion that's close by. Stunning and finishing him of. When the big massacres start stay as far away of the centre as you can while still being able to help out. If youre team is chasing an enemy champion go help then slowing the poor soul, rushng him on his way to hell, but if he is running away and no one is chasing him think twice, make sure you can kill him before going ahead.