^ and it's not going to help when they see you only have 9 normal wins, they might rage especially hard then.
I can't say don't play ranked right away, while I also can't say play 400 normal games first. Start ranked when you feel you are ready and don't listen to anyone else, but yourself.
Play some draft games first though. You don't have to amass 100 wins or nothing, just some warming up. If you're prepared to dedicate a couple hours to the game, play a draft normal to warm yourself up first before you start ranked.
Play draft normals until you win, then play a ranked. If you win continue playing ranked. If you lose go back to normal draft. Etc etc. This way, you can mitgate some of the lost elo in ranked, while still learning what you need to. If you ONLY play ranked you'll find yourself in a fast downward spiral. However, if you switch back and forth you can learn more, without plumetting in elo.
Remember if you lose a SINGLE ranked match, go back to normal. Once you win a normal, immediately go play a ranked. This can keep you momentum going, while helping you recover for loses. If you lose 3 or more in a row, try taking a break. Read some guide, watch streams, etc.
Find a balance between winning and losing and as long as you stay even in wins and loses you should stay between 11-1300 elo.