I'm a noob, level 9, only have a limited amount of games played and haven't played a game in a couple months.
All you really need to do is:
1. Know the basic structure of the game and how it works.
2. Don't get too aggressive and chase.
3. Watch the minimap and try to know where everyone is all the time.
4. Follow one of the guides for whichever hero you are using.
Eventually you will start to pick up on how everything works together and everything will make sense. Once you start getting to know the heroes and can pick them out in a match and know what they can do (knowing their spells and abilities), then you can start thinking about the meta game.
Morgana is pretty sweet for a newbie.