Hi, I'm evo and I am new to league of legends!
I found this website while trying to find a good Tristan's build, and I saw that you could make your own builds and tier lists, so I signed up.
I am level 27 unranked, but have played a lot of matches and thought that I should share this info with you all.
I play Aphelios as an ADC quite a lot, I play Astros top a bit, but from the very start, I have played Ashe because I was looking for the cheapest marksman I could find.

Just to clarify, I have added a lot of notes on all of the builds and runes I have shared with you, so please read them. Also, this is my first time writing a guide so be patient when I'm rambling like this.
Back to Ashe.
I always like to start of with the long sword and health potion kit, since I like stacking AD. I usually build into the critical strike build, which is lethal once you get the whole thing. Once in lane, I like to ward the middle bush, so I can see when my enemies are trying to beat me up. I usually wait in the middle and get my support to ward the bush that is on the pathway leading to the jungle. When the minion wave comes in, I usually farm until there's an opening in the wave, and then I W on my enemy, usually unleashing my lethal tempo. Keep in mind if you are going to follow this 'strategy' then I advise you to stay at a reasonable distance, because your W has good range and you can poke without getting to close. Once you reach level 2, unlock your Q. Now you have two choices, you can poke for a while, and wait till your ultimate, or you can start to put pressure on the enemy with help from a support. This is where a support like Sona comes in handy, because you can W then start auto hitting them, if they fight back, activate your Q and then start chasing them. But, be careful of their support, make sure you still have reasonable distance on them, since this gives you space to retreat in case the support decides to unleash his/here abilities on you. Sona is good because she can heal you while you to in for the kill, and this allows you to retreat without having to recall to soon. Let's say this works and you get a kill, go back to your turret heal if you can, if not, take advantage of the kill and get rid of the wave. Just don't go for the turret plate though, since you are low level and the enemy's respawn time is very short, meaning they can drop on you any time. Clear a wave and recall back to base, then follow the next chapter.
Let's say you fail to kill the enemy, and you take quite a bit of damage. You should probably kill around three more minions without poking, then recall back.

After you take your first recall, choose one of the item kits I have listed depending on how your lane turned out. If you choose the long sword duo combo, you have a good damage lead, but you need to get rid of them quickly to build the items needed for the critical build. Play aggressive depending on what items your enemy has. Just remember, play safe. Now if you decided to go long sword and/or boots, I recommended play at a range, keep poking and try not to rush into things until you unlock your ultimate, and then you can set up a gank, allowing you to clear the lane even if you don't kill your enemy. If you played the cloak of ability, I recommend playing very aggressivley, just try not to play stupid, remember to get an opening first, then go for the kill. But for each build I recommend farming till level six, then gank the enemy and then recall again, because by then you'll have enough gold for good item.

This is where you need to play smart, because Ashe is vunrable to ganks, and so you would need help from your support to clear minion waves and get to the tower. I recommend taking out as much playing as you can before it falls, giving you bonus gold for your build. Just play as safe as you can, but try to get in your W's to whittle down your enemies. By the time you have about 1400+ gold again, recall again and buy a code item like zeal or bilgewater cutlass, meaning you'll have two core items, which will help you get the full build. What I usually do is farm and until I can destroy the turret, giving me enough gold to buy my third core item, and from there start helping your team get the stakes and void monsters.

Honestly, if you have had a smooth early and mid game and everything has happened exactly as planned, then your enemies are in trouble. By the end of mid game you should have around two big items (infinity and essence reaver to name a few) and you should be trying to push on the other lanes, playing very aggressivley and supporting the tank in your team. I don't really have anything to say from her, since it is the same nearly every match, just push and get your full build from here.