Level 30 and placement matches?

Ok so for 2 days ago i became level 30 and then i stopped playing beacuse someone told me that the next 10 matches were gonna be placement matches that places you into a rank. however i find it hard to belive that draft pick should be placement matches, i thought that was normal games without ranking (casual). Ranked solo/duo and ranked is locked for some reason. are the placement matches draft pick and blind pick or can i still continue to just play casually and normal without %%%%ing up my rank without even knowing it. I'm really confused about all this and i have tried to search it up but can't find anything on this matter thanks for reading
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