Newbie at League of Legends

On my LoL (League of Legends) experience so far:

I am pretty much a newbie. My lvl 12 is a real lvl 12 (nearly 13), I have not had other accounts before this one. So I am in the process of learning this game.

From the beginning I liked Ashe most. In all other games I play ranged characters, and so I chose this type for LoL as well.

First thing that was a problem for me, in the very beginning. I had to read so much that it took away from the fun. During matches I would have to click through the shop menu so much to understand what items are for me and which aren't.

I chose completely wrong things of course – until I started watching game plays with commentary, Ashe builds and read on the wiki and on other sites, what a good Ashe-build looks like.

My mistakes in the beginning where these:

1. I realized that I will take a lot of damage, so I built a lot of health. This led to me not hitting well.
2. I realized that my Q,W,R take a lot of mana, so I built a lot of health. This led to me using slots for items that could be used a lot better.
3. I realized that I need to hit faster if I want to kill minions or have a chance in any kind of fight, so I bought stingers a lot.

By this time my build would normally look like this:

2 stinger, 2 frozen heart, boots of swiftness, mana potions

Soon I realized that this is a crappy build. Not only are the stingers obsolete if you build in the direction of say Infinity Edge, Phantom Dancer, and Banshee's Veil, they actually take spots that you might need for other things for the time being.

Say during laning phase you might wanna bring health and mana potions and maybe some sight wards along.

So you better play safe during that phase, have a Doran's Blade as first item and stay in lane as long as you can to farm minions.

I learnt to not push too much for as long as it makes sense. I would rather get the last hits on the minions and then fall back a little, than draw attention to my lane for getting to near to the turrent. This would increase my risk of getting ganked a lot and would simply get my team in a bad position as in that case it is most likely that my turret will be destroyed in no time.

I kept watching game plays and targeted for lvl 30 plays and championships by that time. This was very useful because it started increasing my map awareness. Watching others play and trying to figure out what is happening by checking on the mini map is very useful because I didn't have to pay any attention to anything happening to me or my lane.

Something very good happened, when in a forum a guy showed up. He opened a thread about LoL and asked if anyone would like to play with him. I said, I am new but I would like to.

Turns out this guy is a pro and he started explaining a ton of things to me. Why to build things a certain way, what to do, where to go. He would play a few matches with me and then tell me what was wrong with my game play or build etc.

Recently we simply swapped roles and went bot together. He played ranged to show me how to properly build and play it.

Since then I build like that and try to play like that. Although I am still getting a few ganks, and I still sometimes run out of position for no good reason, I feel I am getting better and more secure.

I start understanding when to push and when to leave.

By now my problem is that obviously at this lvl people are very aggressive. It seems that they care more about killing champions than about destroying turrets, making gold, or even winning.

I have tried other champions as well. 

I tried Miss Fortune and Caitlyn and liked them so far but I have mainly played Ashe.

The one that I played worst so far was Master Yi. And the one I had fun with but really am bad at playing was Dr. Mundo.

I salut everyone who can play anything else but ranged champions. I suck at all these, ranged is the only thing I am ok at.