Only 4 Champions?

A friend of mine told me that the game literally throws champions at you when you play a bit, so you could play draft pick or ranked. I'm currently level 14 and i know that this is not a high level, but im confused that i only have 4 champions so far and i bought all of them with blue essence. Is there a reason I am not getting any champions, or will I get them in the near future?
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