Playing ranked for the first time during preseason.

Hi i can't find the answer in ranked faq , my question is for the new account freshly leveled in the preseason is there a point to play rankeds during it being unranked in the previous season, how does the mmr collected during the preseason affect me at start of the season 9 ? anyone knows? TLDR Im gonna play rankeds during preseason being unranked previous season(season 8), how its gonna affect my mmr in season 9?
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