Nami Advice

I love to play support, mostly {{champion:267}} , I feel confident with it all I just want to know if anyone has any advice so I may adjust my playing style. I've watched vids and asked other people I know but they all tell me the same thing... "don't support" or "support is VERY important" or "why Nami?" so I just want advice from other nami players if at all possible.
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