When should i start playing ranked?

Hi, im a new player into league. I started playing in the end of April/beginning of May. I already new much about the game since i'm friends with people that talk a lot about it. Basically my friend has told me that the best thing i could do was starting ranked as soon as i got the 20 champs unlocked and the lvl 30. I'm a mid laner and basically main Orianna and know other few champs. I would like to know your opinion and i'm open to answer anything. Just wanna know if its still nice to go through with not much time in the game
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