I play it often enough. I'm still trying to acquire all the runes I need for various champions, while buying champions when I feel the need for a new one.
I'm not the best, you can PM me any questions you have though. I'd suggest their forums for additional details, but their layout is too bright. Gives me a headache, could be different for you though, never know.
Playing the game to win can be extremely frustrating, for various reasons. I suggest you try and remember that it is supposed to be fun! Maybe we can play together sometime.
I do a lot of practice games (by myself or with a friend) to try various things out. You should try those, you get to practice builds, play with champion skills, and you win IP even if it is just against the computer.
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Permanently inane.