If you don't know at least 3 champions in each role, don't play ranked

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I honestly can't tell if this is a serious question. But in the chance that it actually is, or at least for people who actually have this train of thought, I'll answer. No, you should not play new champs in ranked. You should play them in normals until you've gained enough experience to play them in ranked.

Huh?

Why not? sometimes i even try new champs in my promo:)))

but i thought lucian was a tank

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That's because they're part of a 5-man team and know they'll get their lane 95% of the time.

And if you always pick two roles in ranked, per new champion select, you'll always get one of those two roles.