Learning Katarina

Hello guys! I have a question and some help is really appreciated! I want to learn to play {{champion:55}} Katarina, and she is obviously not so easy to play. I played her in bot matches, and there I can play her properly, but only because it's with bots. Whenever I go to normal games I suck. And I want to know, to learn her I'm supposed to play in normal matches? With bots it's kinda too easy but on normal I get flamed and even if I tell them I'm still learning her they won't care. So any advice on how to learn her is welcome.
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