Advice on a noob Mage player

Hi, Ive been playing League for a little while now and havent really enjoyed mages all that much. I love the concept of them and see other people pull of amazing kills with Malzahar/Le Blanc and with i could do the same. I dont seem to be able to get much damage from being a mage. it takes ages for me to kill someone off yet other people can 100-0 in seconds and get like 20 kills a game when i could barely get 3 kills in a BOT match.
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