Ahhh, another newcomer!
I taught 4 of my friends how to play back in 2011-12, back in the days where i as forced to play kat mid and try and carry as hard as possible. The good ole days.
With league being such a popular game, the content streams are often flooded with tutorials, and so you kindof have to sift through the bad, and find the good. Let me help you out.
Youtube is where alot of valueble information can be found. People love putting out great, helpful content related to LoL.
If you are BRAND new, this is a GREAT video from Early 2012, (keep in mind some things in the video are outdated.) but the video gives a great overall look at the game and how to play!
Now that you've learned the goals and features of the game, lets get into the meat, the fun, the best part.
PLAYING THE GAME
You may be thinking, well where do I start at this point? My first suggestion would be to play some games against bots, and find that champion you like and/or are interested in. All around the web there are many sites which specialize in builds for certain champions and such. Two that i still use after 4-5 years of gameplay, are Mobafire, and Solomid.net.
Both offer great resources on how to build your favorite champions! These guides include what skills to pick at what levels to maximize champion efficiency, aswell as what items work better on certain champions than others.
Ok so you have your champion you like, and you have your build you like, so lets play! Bot games are great for practicing things you have never learned before, such as learning champion skills, and how different items will feel on your champ.
Once you have played some bot games and are used to your favorite champion, you may want to play against other people. PLEASE DO SO. I remember back when I started way back in the day, I played fiddlesticks. I. LOVED. FIDDLESTICKS. However, I would always get my butt kicked every match. This is where alot of players lose interest in the game. They get pubstomped by better players who are playing down with the noobs. Almost all games have this issue, and you can either 1) ragequit or 2) have fun. Thats why I feel I liked this game so much. I didnt care that I was getting my face beat in, as long as I could use my Ult on Minions and farm those creeps up, I was having a blast. So have fun with it, its a video game, not a profession like alot of people dream they could turn it into.
*Let me link you some solid videos which demonstrate some game mechanics (some new, some old) but most still have meaning.
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Zoning Tutorial - I showed this video to every one of my friends that I taught to play back in the day. As you can tell the map is old, as its from 09, but most of the concepts still apply.
Zoning is something that I don't ever pay attention to, but now that I think about it, it is ALWAYS in the back of my mind when im playing. Its more of a sense you gain the more you play!
Last Hitting- Last hitting creeps (the dudes that walk down the 3 lanes) is essential to playing the game. While you might not think it, the gold you get from last hitting creeps really adds up! (something like the equivalent in gold of 2.5 kills per 50 minions killed). However you have to be wary of enemy champions trying to hurt you, and over time you will gain a sense of when to last hit, and when to harass enemy champions. Hopefully this video will help shed some light on it for you.
The rest of your league training is all down to learning other champions, there abilities which they can use, and what they're goal is in there own team. These goals they have may vary by which positions they are playing.
This is all I have for you now. I hope it was helpful, as I enjoyed writing it. It was good to remember those good times I had learning league.
*I wish you the best of luck summoner. *