It's not a horrible idea to practice on bots before going into pvp.
Yes, I get that normals are usually "practice" for people and such but some of us DO play normals over ranked. Yeah, normals are all about good fun and whatever and I can get behind that all day everyday. However, there is no fun to be had when you go 0/8 before the 12 minute mark simply because you don't know how the champion you are even works. I get that first timers will always have flaws and make big mistakes adepts won't but if you are losing horribly purely because you don't even know Jhin has to stop and reload every 4th shot or Teemo's W isn't an attack speed steroid or maybe that Kindred isn't easy af to jungle with because she is inherently squishy, (Stop getting executed by gromp!) I really think you NEED TO PLAY A BOT GAME FIRST. You have nobody to blame but yourself because you are too proud to use a bot as a practice dummy for 5 minutes. Yes, it's norms but that doesn't mean people don't want to at least ENJOY the game.
Mid and building 
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