Advice for ranked

Hi guys, I'm currently leveling up my summoner account and it is currently level 26. According to my friend, I can play ranked at level 30 so I want to get into it straight away. I'm looking for any advice to help me proceed in the summoner rankings of League of Legends. Preferably from high ranking players so my friends won't laugh at me for being a low rank. I currently don't know what position to play and am testing out all position.
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