FOUR(!) simple things to consider if you want to climb (Trust me, it works!)
The ranked season is already underway and people are getting their jimmies rustled by autofill, "inting" Teammates and "Elo Hell". But what would you say if I told you there are a few simple steps you have to follow to climb to yet unseen heights of Elo? You'd probably call me a scammer, but mind you, following these few ground rules you'll almost definitely start climbing.
Numero Uno: Do NOT flame your teammates or engage in mutual hatred mongering. A pretty simple thing, yet a lot of people are guilty of starting to throw blame around and start getting each other riled up. If you can't just shut your mouth and start flaming your teammates the moment something doesn't turn out the way you want it to just disable the chat function.
Flaming makes you AND your teammates play worse. It serves no cause except making you vent your frustration. Which can just as easily be achieved just grumbling in front of your screen and not bother typing out your death threats and slander.
Use your chat for constructive input or don't use it at all
Numero Dos: Know that you're going to lose. Nobody can maintain a 100% win rate, no use getting all frustrated over losses. Don't let yourself get pulled down by a crushing loss but just look at what you could've done better and move on.
Also, if you lose three in a row STOP playing. I might be Diamond 4 but I've been demoted numerous times simply by tilting and continuing to play, accumulating pretty impressive losing sprees.
Numero Tres: Don't try copying pros or the current FOTM. Play whatever YOU're good at. Stick to comfort picks and champions that fit your play style rather than trying to earn cheap LP by spamming the current OP champions. They'll get nerfed eventually anyways or be banned most of the time.
I'd rather have someone who's good at Jarvan than a mediocre Graves on my team.
Autofill is a reality Sometimes you'll get autofilled, no need to complain about it. There are countless of easy champions to play in the roles you were filled in, so please consider picking them up and play them whenever you're filled.
Top:
Jungle:
Mid:
ADC:
Support:

Following these few principles you'll see yourself improve in rating in no time!
Jungle: 
approves
when you back and not 6 items. Pretty simple.
is somewhat forgiving because your spells give you a lot of control.
Have an escape/gap closer, depending on use

- seriously it's halarious
or
before any of these guys.