Hello and welcome to my guide for Ashe.
This is going to be a straith forward guide to how I play Ashe with minimal useless data. When playing Ashe you are always going to have cc from your Q and W (unless out of mana).Using this you can easily kite running away enemies or slow enemies that are chasing you. You can use Ashe's ulti to snipe out champions, or start a teamfight.

So? WHAT KIND OF CHAMPION IS ASHE?
Ashe is mostly valued for her strng intiation with her ultimate [Enchanted Crystal Arrow]. She is not very strong early game and thus needs a lot of farm for items. Because of her weak early game she is not really suitable for aggressive supports.

Farm like a boss. If the enemy adc decides to overextend, punish him with your W. Make sure your support is warding and zoning the enemy. Don't overuse your W early game, or you might suffer from mana loss when you need it. When you and your support decide to atack, pop your Q up and kite the adc. When fighting focus on the carry rather than the support. When you are in fear that you are getting ganked and have no wards on the lake, pop up your E and check.

When harassing with your W, take care not to push the lane too much.

Countinue to farm. If doing good you should have a couple of kills by now. You can try helping the other lanes get kills by shooting your ult ( Only when you are sure you aren't going to need it.) If you manage to stun someone this might result in a easy kill and an assist for you. If grouping on mid lane, concider taking the red buff. Take the dragon for extra gold and never walk alone ( unless 100% safe). Pretty strait forward.

Staying together with your team is especially a must-do in the late game. If you get taken out and a teamfight happens it will be 4v5 and chances are your team will lose it.

When using your arrow to engage, make sure you stun their adc,in a position easy for your team to pick up the kill on him. HOWEVER: If noone in your team but you has CC such as stun, it is better to save it against enemies that have ults like Katarina.

POSITIONING
Make sure you are ALWAYS behind your team.
As the adc you are the prime target in teamfights, thats why you have to stay back and not let anyone get to you. While your team focuses their adc, you focus the one who is the nearest to you. NEVER EVER EVER go in the middle of the teamfight, just to focus their adc or apc.

Pick up Gold per 10 (avarice blade) and stack some Doran's blades.

also ,

FARM FARM FARM FARM

Yep. That's all o have to say about this guide in a strait forward fashion, whithout blocks of text.

Ofcourse, there is a lot more I can say, about this guide,but I find all that infromation self-explanatory.

Good luck and have fun!