Hmm...if your looking for an easy support/mid, I'd say that **Annie, Karma and Lulu **are all pretty easy.
Annie is a mage that deals a lot of damage. Her abilities are very straightforward and easy to use, like her Q, which is a point and click damage ability! She also has a bear named Tibbers she can use during her ultimate, which is very unique to her.
Karma can be played as a mage or a support. She does have one skillshot, but it is pretty easy to land. Karma is what I like to call a generalist...she does everything remotely decently, but doesn't have a major strength. The cool part about Karma though, is her ultimate called 'Mantra'. Mantra enhances one of her abilities, making it have additional effects.
And finally, Lulu is a support that can also be played as a mage. Lulu has 3 point and click abilities and some of the most crowd-control in the game (a slow, polymorph and a knock-up), so she will always be useful even when she is behind. Lulu doesn't deal a lot of damage, but her abilities do a lot of things. I'd say Lulu is a good champion if you want to learn about decision-making.
Annie costs 400 IP, Karma costs 3150 IP and Lulu costs 6300 IP, so you may not be able to get Lulu unless you get a little more IP :)