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Frost Shot(Q) - While active, each of Ashe's basic attacks slow her targets. This drains Mana with each attack.
Toggle: Ashe's basic attacks slow her targets by 15/20/25/30/35% for 2/2/2/2/2 seconds.
Cost
8/8/8/8/8 Mana per Attack
Range
600
Explanation: A good slow that gets progressively better as you level it up. This is a great skill to chase champions or to kite enemy champions. Make sure to only use this ability on enemy champions, since it can completely drain your mana pool if you use it to last hit creeps.
Volley(W) - Ashe fires 7 arrows in a cone for increased damage. Volley also applies Ashe's current level of Frost Shot.
Ashe fires //// arrows in a cone dealing 40/50/60/70/80 (+) physical damage. Volley also applies Frost Shot.
Cost
60/60/60/60/60 Mana
Range
600
If im not mistaken, volley range is longer than auto attack range (of frost shot).
Your masteries I disagree with very slightly, but its not a huge deal, as its very minor.
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V. Item Build
Core Items:
Zerker Boots
Infinity Edge
Phantom Dancers
Last Whisper
Banshees Veil
Phantom Dancers/Guardian Angel
If the game progresses further along, sell zerker boots for Phantom Dancers. Make sure to pick up Elixirs at the beginning of the mid-late game so you have an advantage over your opponents. Elixirs can make a HUGE difference in the outcome of a fight.
Explanation:
Zerker boots because you need the IAS. I really recommend you get these every time, even if the other team has a lot of CC. Ashe's survivability comes from her positioning in battles, not from her defensive items. Make sure to not get caught out of position. Infinity Edge has great synergy with Ashe's passive, and should be taken with every auto attack AD carry in general. Great overall item. Phantom Dancers is another great item that has great synergy with Ashe because of her passive. Last Whisper is a must get on every AD carry. If you don't get this item, you will be doing a great disservice to your team because you won't be able to do as much damage to every hero as you possibly could(a.k.a. tanks). Banshees Veil is still the gold standard for survivability Items. You can get a Quick Silver Sash if the other team has a WW/Malzahar that just try to rape you with their suppress. Phantom Dancers if you are doing well, or Guardian Angel if you are having trouble staying alive. Make sure to get elixirs and to change your boots to PDS if time allows.
Item build - It's lacking, very lacking.
You should ATLEAST mention Black Cleaver, Bloodthirster, Bloodrazors, brutalizer, boots of swifts, merc treads, etc.
I don't reccomend guardian on ashe, as she'll easily be taken back down (Its not worth it on most carries) and you could of spent that extra money on more damage (or other survivability thats more worth it).
You also mentioned Last Whisper being a must. I strongly disagree and you should mention its not all that worth it until an enemy has stacked ~120armor or higher (typically more than one enemy, as the tank isnt important to do damage to).
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Starting Items should be Boots and 3 health potions. If you are facing a weak lane champion or if you are just confident that you will steamroll the other champion, then get a broadsword and a health pot. Your main objective will be to farm, farm, and farm. Don't get distracted by trying to go for kills without ganks. If you spend your time and energy into harassing an enemy champion and neglect to farm, you will be screwed if you don't get the kill. Make sure to focus on farming! I recommend not ganking unless either of the side lanes is overextended and around 50 percent health. If you don't get the kill or an assists, you will have lost the chance to farm that money in your lane. It is very important that you continue to farm throughout the game! Make sure to farm at least your zerker boots by the time you go back to base if you started with boots, and if you managed to farm enough for BF sword, then go ahead and buy that. In order to be successful with Ashe, you have to be very careful when playing. Make sure to use your hawkshot to scout the area you are heading to so you don't fall into enemy traps. You WILL be the focus of their fire and they will try their best to kill you every chance they get. So make sure you only last hit in your lane and only push your lane if the other lanes/jungler are accounted for.
You should mention Teleport Ulting.
Using your ult, then teleporting so the ult hits and youre right there to kill the person.
You should also mention if your ult hits a target, damage is spread around the target - so you can steal buffs/other with it.
You should gank ANYTIME you can as it stops the enemy champions from farming and typically scares them a little. (The only time you shouldnt do this is if a lot of champions are mia, or your lane is being pushed).
You should also mention if you should be getting red or blue or not. Typically ashe doesnt need red, but in some team comps its best used on her. Blue is great on ashe, but can typically be better utilized with other champions - though it is nice to have a super low CD arrow/volley.
Other than that, you have a decent guide - It's a little flat and uninteresting, but has some solid information.
Goodjob.